| Patents for B43L 9 - Circular curve-drawing or like instruments (2,793) |
|---|
| 04/03/1990 | US4912855 Instrument and case |
| 03/14/1990 | CN2054405U Multipurpose combined compasses |
| 03/14/1990 | CN2054404U Multipurpose teaching compasses |
| 03/07/1990 | CN2053987U Multipurpose compasses teaching aid |
| 02/28/1990 | CN2053576U Agile compasses |
| 02/28/1990 | CN2053575U Length-adjustable compasses for direct teaching |
| 02/21/1990 | CN2053151U Oblate compasses |
| 02/14/1990 | CN2052724U Table type multipurpose combination compass |
| 02/14/1990 | CN2052723U Multipurpose compass capable of using as straightedge and protractor concurrently |
| 02/13/1990 | US4899449 Drafting instrument |
| 02/13/1990 | CA1265673A1 Drawing instrument |
| 01/31/1990 | CN2051896U Multi-purpose drawing instrument |
| 01/24/1990 | CN2051571U Compass with multileg |
| 01/10/1990 | EP0349784A1 Compass |
| 12/28/1989 | WO1989012534A1 Compass |
| 12/21/1989 | DE3820371A1 Fine lead insert for compass legs |
| 12/14/1989 | WO1989011978A1 Cap for writing instruments |
| 12/14/1989 | DE3836682C1 Compass |
| 11/15/1989 | CN2047634U Multi-functional compass |
| 11/07/1989 | US4878409 Circular mat cutting apparatus |
| 11/01/1989 | CN2046814U Multifunction compasses |
| 11/01/1989 | CN1036730A Variable-curvature arcograph |
| 10/18/1989 | CN2046080U Trigonometric function and optimum seeking point proportional dividers |
| 09/27/1989 | CN2044936U Bisector proportional compasses |
| 09/21/1989 | DE3836683C1 Compass with adjustment spindle, especially rapid-adjustment compass |
| 09/14/1989 | DE3807035A1 Messzirkel Calipers |
| 09/08/1989 | WO1989008235A1 Measuring compass |
| 08/23/1989 | CN2043190U Multifunctional compass |
| 08/22/1989 | US4858326 Geometric instrument and method of making same |
| 08/16/1989 | CN2042800U Multipurpose drawing instrument |
| 08/09/1989 | CN2042416U Multi-function compass |
| 08/02/1989 | CN2042021U 多用椭圆规 Multi-oval regulation |
| 07/19/1989 | EP0324053A2 Leg releasing lever for a bow compass |
| 07/05/1989 | CN2040442U Multipurpose ellipse compasses |
| 07/05/1989 | CN2040441U Multipurpose ruler |
| 07/05/1989 | CN2040440U Universal compasses |
| 07/04/1989 | US4843719 Pair of measuring compasses |
| 06/28/1989 | CN2040036U Multi-function curve compass |
| 06/15/1989 | WO1989005237A1 Device for finding the center of a circumference of a circle or arc of a circle |
| 06/01/1989 | WO1989004770A1 Drawing instrument |
| 06/01/1989 | DE3838473C1 Fine adjustment compass |
| 05/24/1989 | CN2038056U Vortex motion compasses |
| 05/16/1989 | CA1254031A1 Beam compass having changeable parts |
| 05/11/1989 | DE3808511C1 Fine-adjustment compass |
| 05/03/1989 | DE3735416A1 Combined writing, drawing and measuring instrument |
| 05/03/1989 | CN1032704A A pair of measuring compasses |
| 05/03/1989 | CN1032642A Vernier type multipurpose drafting instrument |
| 04/19/1989 | EP0311710A1 Gauge compass |
| 04/12/1989 | CN2035714U Pointless center mark compass |
| 04/12/1989 | CN2035713U Compass for blackboard drawing |
| 03/28/1989 | US4815881 Multi-purpose combination writing instrument |
| 03/08/1989 | CN2033752U Automatic circle drewing appliance |
| 03/08/1989 | CN2033751U Disc compasses |
| 03/08/1989 | CN2033748U Universal utensil pen |
| 02/23/1989 | DE3808554C1 Apparatus for drawing arcs of different radii |
| 02/23/1989 | DE3726638A1 Round template system |
| 02/22/1989 | CN2032944U Nonius multipurpose mapper |
| 02/21/1989 | CA1250140A1 Line drawing instrument |
| 01/04/1989 | CN2030150U Accurate compasses with major diameter |
| 01/03/1989 | US4794699 Marker holding device for an ice scribe |
| 12/28/1988 | CN88219156U Multifunctional telescopic compasses |
| 11/30/1988 | CN88203337U Dual-purpose circle and ellipse gauge |
| 11/10/1988 | DE3813293A1 Kombination aus einem messwerkzeug und einem werkzeug mit scharfer kante Combination of a measuring tool and a tool with a sharp edge |
| 11/09/1988 | CN88212437U Folding type multi-purpose teaching compasses |
| 11/02/1988 | CN87213568U Radian compasses |
| 10/19/1988 | CN88212063U Arcograph without circle center |
| 10/12/1988 | CN87101527A Vernier type multipurpose drawing instrument |
| 10/06/1988 | DE3708726A1 Length-measuring device for items of clothing |
| 09/14/1988 | CN87201501U Multipurpose compass |
| 09/07/1988 | CN87211152U Multi-purpose compass |
| 08/31/1988 | CN88200282U New multipurpose compasses |
| 08/24/1988 | CN87212546U Conical section gauge |
| 08/10/1988 | CN87216359U Combined drawing instrument |
| 08/10/1988 | CN87214171U Tripurpose vernier compass |
| 08/02/1988 | US4760648 Marking device |
| 07/28/1988 | DE3701182A1 Beam compass |
| 07/20/1988 | CN87212167U Multi-function compasses |
| 07/06/1988 | CN87201628U H-type compasses with ruler |
| 06/22/1988 | CN87215141U Suction cup type teaching compass with single stem |
| 06/22/1988 | CN87212742U Card for drawing circle |
| 06/22/1988 | CN87211929U Arbitrary circle divider |
| 06/01/1988 | CN87212308U Plate type multipurpose compasses |
| 05/18/1988 | CN86107623A Multi-functional equipment for erasing hand-writings on the magnetic writing board |
| 05/17/1988 | US4744149 Marker holding device for an ice scribe |
| 04/26/1988 | US4739558 Line drawing instrument |
| 04/12/1988 | US4736526 Geometry template |
| 04/07/1988 | WO1988002312A1 Beam compass having changeable parts |
| 04/07/1988 | DE3631605A1 Drawing apparatus |
| 04/05/1988 | US4734992 Drawing instrument |
| 03/23/1988 | CN87208302U Angle divider combined ruler with compass |
| 03/23/1988 | CN87205922U Big radius arcograph |
| 03/16/1988 | CN86105949A Versatile curve instrument |
| 03/02/1988 | CN87208125U Nib of tracing compasses |
| 02/24/1988 | CN85205594U Compass pantograph |
| 02/17/1988 | CN87206506U Solid angle gauge |
| 02/10/1988 | CN85203795U Multi-purpose pen-type portable compass |
| 01/27/1988 | CN86104663A Improved drawing compasses with six functions |
| 12/26/1987 | CN87202918U 多功能的自动圆规 Multifunctional automatic compass |
| 12/03/1987 | DE3626588C1 Measuring compass |
| 11/04/1987 | CN87200107U Compass with scale |