| Patents for B23B 41 - Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor (5,345) |
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| 02/27/1991 | CN2071991U Internal hole grooving device |
| 02/27/1991 | CN1049465A Tapered aperture stainless steel processing method |
| 02/19/1991 | US4993131 Method and apparatus of infinitely sizing a mini blind |
| 02/12/1991 | US4992010 Masonry |
| 02/06/1991 | EP0411362A1 A gas spring, a method of filling a gas spring with pressurized gas and an installation for performing the method |
| 01/30/1991 | CN1011393B Device for cleaning the welding bead in plastic tube |
| 01/29/1991 | CA1279505C Line boring apparatus |
| 01/16/1991 | CA2021132A1 Gas spring, a method of filling a gas spring with pressurized gas and an installation for performing the method |
| 01/15/1991 | US4984941 Apparatus for forming a suture cut-off feature in a surgical needle possessing a suture-receiving socket |
| 01/09/1991 | EP0406238A1 Method and means for connecting a branch conduit to an existing conduit. |
| 01/09/1991 | CN2068870U 精密镗头 Precision boring head |
| 01/09/1991 | CN1011128B Boring device for cutting bores and shafts with arbitrary shapes |
| 01/03/1991 | DE3920462A1 Machining of holes and openings in metal or plastic profile windows - in which machinery operates automatically and can work independently or in conjunction with welding and weld dressing machine |
| 12/25/1990 | US4979850 Apparatus for precision line boring of engines and like mechanisms |
| 12/19/1990 | CN2067618U Dual-purpose big-caliber tube holing machine operated by electricity or hand |
| 12/18/1990 | US4978255 Tapping fluid supply pipes |
| 12/12/1990 | EP0358696A4 Plate working machine |
| 12/04/1990 | CA1277430C Resin-coated aluminum separator-release sheets for manufacturing printed circuit boards |
| 11/27/1990 | CA1276815C Transportable line boring machine |
| 11/20/1990 | US4971486 Undercutting drill |
| 11/07/1990 | EP0395687A1 Surfacing machine |
| 10/31/1990 | CN2064694U Closely-packed pinhole processing device |
| 10/24/1990 | EP0393560A2 Tapping apparatus |
| 10/23/1990 | US4964475 Drilling device for producing drill holes with undercut |
| 10/17/1990 | CN1009995B Method of operating numerically controlled machine tool having workable capable of rotation about two intersecting axes |
| 10/16/1990 | US4962820 Device for producing drill holes having an undercut |
| 10/10/1990 | CN2063454U Adjustable angle device for boring taper hole and taper thread |
| 09/26/1990 | CN2062662U Pipeline drill machine |
| 09/12/1990 | EP0386532A1 Drill spindle depth adjustment |
| 09/11/1990 | US4955951 Boring apparatus |
| 08/08/1990 | CN1044425A Universal table drill for tapping |
| 07/12/1990 | DE3909024C1 Boring implement for making holes in service lines |
| 07/10/1990 | US4939965 Cutting and the like tools |
| 07/05/1990 | DE3900123A1 Piercing device for piercing a coolant pipe in a refrigerating device for disposal |
| 06/13/1990 | CN2058116U Miniature multi-function bench drilling machine |
| 06/12/1990 | US4932814 Portable line boring machine |
| 05/30/1990 | EP0370204A1 Drilling device for producing a drilled hole with a recess |
| 05/29/1990 | US4929127 Drill bit for producing drilled holes with an undercut |
| 05/16/1990 | CN1042109A Drilling device to produce drill holes with undercut |
| 05/09/1990 | CN1041906A Drilling device for producing drill holes with undercut |
| 05/02/1990 | EP0365796A2 Drilling device for making holes with undercuttings |
| 04/18/1990 | EP0363617A1 Drilling device for producing drilled holes with recesses |
| 04/11/1990 | CN2055757U Big pitch screw hole tapping device |
| 03/28/1990 | CN1040757A Drilling apparatur for producing drilled holes having undercut |
| 03/21/1990 | EP0358696A1 Plate working machine. |
| 03/14/1990 | EP0358247A1 Device for providing a passage in a side wall of a pipe |
| 02/28/1990 | EP0355321A1 Device for manufacturing bore holes with undercutting |
| 02/20/1990 | US4902174 Main line tapping apparatus |
| 02/13/1990 | US4900201 Drill spindle depth adjustment |
| 02/13/1990 | US4899458 Process and device for centering a guide mandrel |
| 01/30/1990 | US4897000 Clamping mechanism for an apparatus for drilling or countersinking holes in a workpiece |
| 01/18/1990 | DE3822615A1 Bohreinrichtung mit mindestens einem umlaufenden bohrkopf mit einem quer zur drehachse fein einstellbaren werkzeugtraeger A drilling rig with at least one rotating drilling head with a transverse to the axis of rotation finely adjustable toolholder |
| 01/11/1990 | DE3830395C1 Boring fitting |
| 12/27/1989 | EP0347556A1 Drilling tool for manufacturing drilled holes with recesses |
| 12/21/1989 | DE3820761A1 Boring appliance for pipelines |
| 11/28/1989 | CA1263422A1 Molded tapping member formed of a weldable plastics material |
| 11/23/1989 | EP0342623A2 Clamping mechanism for an apparatus for drilling or countersinking holes in a workpiece |
| 10/25/1989 | EP0172809B1 Automatic traversing drilling unit and method of using |
| 10/25/1989 | CN2046414U 不锈钢深孔钻头 Stainless steel drill hole |
| 10/12/1989 | DE3904495A1 Boring fitting |
| 10/11/1989 | CN1036158A Boring device for cutting bores and shafts with arbitrary shapes |
| 10/10/1989 | US4872787 Method of drilling printed circuit board |
| 10/04/1989 | EP0334900A1 Undercutting drill. |
| 10/04/1989 | CN2045341U Machine for tube holing and wire-coiling |
| 10/03/1989 | US4871285 Cylinder boring apparatus and method |
| 09/28/1989 | DE3827766C1 Shut-off device for a pipe-tapping fitting |
| 09/27/1989 | EP0333744A1 Method and apparatus for manufacturing printed circuit boards. |
| 09/26/1989 | US4869627 Guide device for a deep drilling tool |
| 09/26/1989 | CA1261818A1 Apparatus for obtaining ring-shaped cavities in the bottom of drilled holes made in any type of medium |
| 09/19/1989 | US4866834 Method for producing mounting and valve bores in a wheel |
| 09/14/1989 | DE3807161A1 Drill for drilling square holes |
| 09/06/1989 | EP0331081A2 Boring apparatus |
| 09/05/1989 | US4862568 Apparatus to drill and tap a hollow underwater member |
| 08/03/1989 | DE3801573A1 Device for separating spot-welded sheets |
| 08/02/1989 | EP0325733A2 Drilling device for making holes with undercuttings |
| 07/18/1989 | US4847961 Method and apparatus for stitch-machining deep cavities in metal workpieces |
| 07/05/1989 | EP0323046A2 Method and appratus for stitch-machining deep cavities in metal workpieces |
| 06/27/1989 | US4842452 Surfacing machine |
| 06/27/1989 | US4842450 Method and apparatus for self-adjusting boring bar |
| 06/22/1989 | DE3840864A1 Device for treating, in particular sealing, pipelines which are subjected to media pressure, such as house lead-ins for gas or water |
| 06/22/1989 | DE3840569A1 Device for cutting out plugs inserted into a pipe wall |
| 06/13/1989 | US4838742 Method and apparatus for making an undercut drilled hole in a fixed base |
| 06/01/1989 | WO1989004938A1 Method and means for connecting a branch conduit to an existing conduit |
| 05/24/1989 | EP0316552A2 Device for machining bolt holes or valve holes into a wheel disc or a rim of a motor vehicle wheel |
| 05/23/1989 | CA1254403A1 Boring process and apparatus |
| 05/17/1989 | EP0315829A2 Drill back-up material for small bore drilling of circuit boards |
| 05/10/1989 | EP0315277A1 Method and apparatus for testing underground concrete pipes |
| 05/03/1989 | DE3735859A1 Method for making fixing holes or valve holes in a disc or a rim of a wheel of a motor vehicle |
| 04/26/1989 | EP0312819A1 Method of machining bolt-holes and valve holes into a wheel-disk or a rim of a motor vehicle wheel |
| 04/26/1989 | CN2036467U Tube working machine for bending, screwing, cutting and chamfering |
| 04/26/1989 | CN1032513A Cutting and the like tools |
| 04/20/1989 | WO1989003269A1 Surfacing machine |
| 03/28/1989 | US4815904 Drilling assembly for making boreholes with undercuts |
| 03/22/1989 | EP0308155A2 Cutting and the like tools |
| 03/07/1989 | US4809735 Valve and tapping tee apparatus and method |
| 03/01/1989 | CN2033313U Boring and milling machine with universal spiracle base |
| 02/22/1989 | EP0304246A1 Tapping fluid supply pipes |
| 02/09/1989 | DE3820762A1 Boring appliance for pipelines |
| 02/09/1989 | DE3725240A1 Boring device for pipelines |
| 02/08/1989 | EP0302202A2 Device for attaching fasteners |