| Patents for B25B 21 - Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose (7,850) |
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| 04/18/1989 | US4822958 Electric rotary power tool apparatus holdable by hand during operation, kit comprising the same; and novel switch means therefor |
| 04/18/1989 | US4821877 Screw magazine for an apparatus for inserting and removing screws |
| 04/18/1989 | US4821611 Tightening device |
| 04/11/1989 | US4819520 Stationary cylinder torque wrench |
| 04/11/1989 | US4819519 Automatic stud driver having thread relief for high torque applications |
| 04/05/1989 | EP0309625A1 Hydraulic pulse wrench |
| 04/05/1989 | CN2035301U Shifting mechanical wrench |
| 04/04/1989 | US4818157 Use with a chuck of an electric drill |
| 04/04/1989 | US4817667 Metering regulator for pneumatic tools |
| 03/29/1989 | CN2034895U Hand-held mini-size electric wrench |
| 03/29/1989 | CN2034894U Hydraulic machinery wrench |
| 03/28/1989 | US4815345 Portable hydrant wrench |
| 03/28/1989 | US4815344 Control mechanism of a bolt stressing unit |
| 03/22/1989 | CN2034508U Inertia power wrench |
| 03/21/1989 | US4813312 Power-wrench, a boiling spindle and an operational method |
| 03/14/1989 | US4811797 Impact wrench |
| 03/07/1989 | US4810916 Rotary power tool having dual outputs |
| 03/07/1989 | US4809572 Power driven screwdriver |
| 02/28/1989 | US4807349 Fastener removing method |
| 02/23/1989 | WO1989001390A1 Motor-driven apparatus for manipulating valves |
| 02/22/1989 | EP0304002A1 Drill for portable drilling machine, screw holding bit and method for manufacturing these tools |
| 02/22/1989 | CN2032929U Mounting unit for wood screw |
| 02/21/1989 | US4805706 Rotary impact apparatus |
| 02/21/1989 | US4805496 Hydraulic power wrench |
| 02/21/1989 | US4805404 Portable pneumatic machine having embodied control electronics |
| 02/14/1989 | US4804048 Hand-held tool with shaft lock |
| 02/14/1989 | US4803904 Extension device for power screwdriver |
| 02/14/1989 | CA1249934A1 Wheel rim wrench |
| 02/08/1989 | EP0302229A2 Rotary electric tool with a variable speed gearing |
| 02/08/1989 | EP0302202A2 Device for attaching fasteners |
| 02/07/1989 | CA1249739A1 Fastener and nosepiece for installing lath |
| 02/07/1989 | CA1249738A1 Stud installer |
| 01/18/1989 | EP0299477A1 Hydraulically operable hand tool |
| 01/18/1989 | EP0299324A1 Remotely controllable tube connection and multi-purpose tool therefor |
| 01/10/1989 | US4796319 Combination screw-tapping and screwdriving tool |
| 01/04/1989 | EP0297515A1 Torque and angular displacement sensing in yield threshold controlled wrenches |
| 01/03/1989 | US4794826 Hydraulic powered wrench |
| 01/03/1989 | US4794825 Hydraulic power wrench |
| 12/29/1988 | DE3820629A1 Supply and braking circuit for a universal motor |
| 12/29/1988 | DE3645027A1 Screwing device driven by a pressure medium |
| 12/27/1988 | US4794273 On/off control system for power operated hand tools |
| 12/27/1988 | US4793226 Manual device for driving screws |
| 12/21/1988 | CN88201838U Electric ratchet wheel wrench |
| 12/20/1988 | US4791836 Ratchet mechanism |
| 12/20/1988 | US4791690 Combination drill bit and socket drive assembly |
| 12/20/1988 | CA1246946A1 Impulse tool having shut off system |
| 12/14/1988 | CN88210260U Shock type screwdriver |
| 12/13/1988 | US4790218 For imparting rotational torque to objects |
| 12/07/1988 | EP0293706A1 Screwing tool |
| 12/06/1988 | US4789373 Hydraulic torque impulse generator |
| 11/30/1988 | EP0293281A1 Device for screwing and unscrewing bolts and nuts of large dimensions |
| 11/30/1988 | EP0292752A2 Hydraulically impulsed screwdriver |
| 11/22/1988 | US4785693 Hydraulic torque wrench |
| 11/22/1988 | US4785520 Process for locating the ideal screwing position of bolts of large dimensions |
| 11/09/1988 | EP0290411A2 Hydraulic torque impulse generator |
| 11/08/1988 | US4782726 Lead screw driver |
| 11/01/1988 | US4781220 Fast response shut-off valve |
| 11/01/1988 | US4780944 Method and tool for the freeing of parts held fast together |
| 10/18/1988 | US4778015 Pneumatic power wrench |
| 10/12/1988 | EP0285888A1 Ratchet mechanism |
| 10/11/1988 | US4776561 Trigger control for air tool handle |
| 10/05/1988 | EP0284894A1 Fastening device with a screw, and impact tool for universal fastenings |
| 10/05/1988 | EP0284755A1 Screwing device |
| 10/05/1988 | CN87215787U Single chip machine intelligent torsional hand |
| 10/04/1988 | US4775269 Hand held tool with removable chuck |
| 09/27/1988 | US4773487 Speed limiter for an air powered tool |
| 09/20/1988 | US4771661 Vibratory pipe wrench |
| 09/14/1988 | EP0281775A2 Variable speed gearing in rotary electric tool |
| 08/30/1988 | US4767379 Hydraulic torque impulse generator |
| 08/30/1988 | US4766787 Two-blade type impulse wrench |
| 08/30/1988 | US4766784 Pneumatic tool with a replaceable tool bit turning screws and nuts |
| 08/30/1988 | US4766783 Extension device for power screwdriver |
| 08/23/1988 | US4765210 Hydraulically powered screwing means |
| 08/23/1988 | EP0230461A4 Power driven replaceable socket ratchet wrench. |
| 08/23/1988 | CA1240933A1 Locking mechanism for a rotary power machine |
| 08/23/1988 | CA1240857A1 Tools for use in tightening or removing screw- threaded fasteners |
| 08/09/1988 | US4762035 Depth adjusting device for screwdrivers |
| 08/09/1988 | US4762030 Fastener collar removal tool |
| 08/03/1988 | EP0277105A1 Power tool for two step tightening of screw joints |
| 08/03/1988 | EP0276936A1 Improvements in or relating to torque wrenches |
| 08/03/1988 | CN88100320A Improved torque spanner |
| 08/02/1988 | US4761151 Hydraulic torque impulse generator |
| 07/26/1988 | US4759225 Torque tool and torque tool analyzer |
| 07/19/1988 | US4758754 Portable electric tool with variable torque |
| 07/12/1988 | US4756216 Turn-on and turn-off control apparatus for electric screw-drivers |
| 07/07/1988 | DE3643908A1 Screwing device driven by a pressure medium |
| 07/05/1988 | US4754669 Motor driven screwdriver with spindle lock |
| 06/28/1988 | US4753142 Power-driven screwing head |
| 06/28/1988 | US4753139 Fluid-operated wrench |
| 06/23/1988 | EP0245370A4 Powered pipe wrench. |
| 06/14/1988 | US4750750 Socket drive adapter |
| 06/14/1988 | CA1238019A1 Stroke adjusting mechanism of blind nut setting tool |
| 06/07/1988 | US4748873 For torquing a member |
| 06/07/1988 | US4748872 Flexible power tools |
| 06/01/1988 | EP0268715A1 Two-blade type impulse wrench |
| 06/01/1988 | DE3639798A1 Screwing device in the form of drilling machine attachment |
| 05/31/1988 | US4747204 Method of installing drive nut blind fasteners with cap nuts |
| 05/17/1988 | US4744271 Ratcheting box wrench |
| 05/11/1988 | EP0267169A2 Hydraulic torque impulse generator |
| 05/11/1988 | DE3636513A1 Gripper device for carrying out screwing operations |