| Patents for B43L 7 - Straightedges (3,964) | |
|---|---|
| 07/1989 | |
| 07/26/1989 | CN2041628U Multipurpose parallel ruler |
| 07/13/1989 | DE3840645A1 Rule (ruler) for measuring and drawing - a device which incorporates all conventional rules |
| 07/05/1989 | CN2040441U Multipurpose ruler |
| 06/1989 | |
| 06/21/1989 | CN2039632U Five-use form ruler |
| 06/21/1989 | CN2039629U Selective type straightedge |
| 06/13/1989 | US4839833 Programmable display engineering scale |
| 06/06/1989 | US4835877 Try square protractor |
| 06/01/1989 | WO1989004770A1 Drawing instrument |
| 05/1989 | |
| 05/23/1989 | US4831739 Adjustable template device for framing and cutting sheet materials |
| 05/17/1989 | CN2037682U Multifunctional drawing rule |
| 05/03/1989 | DE3735416A1 Combined writing, drawing and measuring instrument |
| 05/03/1989 | CN2036902U Four angle ruler for drafting |
| 05/03/1989 | CN2036899U Hatching ruler |
| 04/1989 | |
| 04/26/1989 | CN2036496U Combined multifunction simple mapping apparatus |
| 04/26/1989 | CN2036492U Interesting multipurpose stationery rule for juvenile |
| 04/25/1989 | US4823475 Drafting device |
| 04/18/1989 | US4821424 Drafting instrument |
| 04/11/1989 | US4819338 Drawing instruments |
| 04/05/1989 | CN2035322U Multi-function drawing rule |
| 04/05/1989 | CN2035321U Multi-function drawing rule |
| 03/1989 | |
| 03/29/1989 | CN2034911U Ruler for centering arc |
| 03/22/1989 | CN2034527U Multipurpose portable ruler |
| 03/15/1989 | CN2034123U Multipurpose roll marking rule |
| 03/08/1989 | CN2033750U Adjustable indicating scale |
| 03/01/1989 | CN2033345U Parallel set rule with singl ruler |
| 02/1989 | |
| 02/08/1989 | CN2032145U Adjustable triangular ruler |
| 02/01/1989 | CN2031955U Equiangular protractor series |
| 02/01/1989 | CN2031766U Vertical plane multipurpose ruler |
| 01/1989 | |
| 01/25/1989 | CN2031356U Multi-purpose ruler for student |
| 01/18/1989 | CN2030948U 绘图工具 Drawing Tools |
| 01/05/1989 | DE3721093A1 Angle measurement device |
| 12/1988 | |
| 12/21/1988 | CN87209752U Ruler for drawing |
| 12/01/1988 | DE3715500A1 Set square |
| 11/1988 | |
| 11/16/1988 | CN87216261U Coiled ruler for line-drawing |
| 11/16/1988 | CN87201757U 组合平行尺 Combination of parallel ruler |
| 11/09/1988 | CN88202692U Multipurpose handy ruler |
| 10/1988 | |
| 10/25/1988 | US4779346 Transparent measuring device with multicolored lines |
| 10/19/1988 | CN88212045U Drawing h-squar |
| 09/1988 | |
| 09/28/1988 | EP0267265A4 Framer. |
| 09/21/1988 | CN87212801U Multipurpose ruler |
| 09/07/1988 | CN87207122U L-precise drawing rule |
| 08/1988 | |
| 08/31/1988 | CN88201735U Multiuse student's rule |
| 08/24/1988 | CN87211441U Combined article for studying mathematics and physics |
| 08/17/1988 | CN87212363U Multi-functional drawing rule |
| 08/17/1988 | CN87201694U Multi-purpose differentiating rule |
| 08/03/1988 | CN87216074U T-square with counter |
| 07/1988 | |
| 07/13/1988 | CN87208414U Roller type drawing straightedge |
| 06/1988 | |
| 06/29/1988 | CN87215646U Multi-purpose ruler |
| 06/15/1988 | CN87211530U Bridge type drawing rule |
| 06/01/1988 | CN87214466U Multipurpose teaching ruler |
| 05/1988 | |
| 05/25/1988 | EP0267943A1 Video production system and method |
| 05/25/1988 | EP0267911A1 Educational visual aid particularly for demonstration in solid geometry |
| 05/25/1988 | CN87207510U Drawing set square suitable for tracing |
| 05/24/1988 | CA1236972A1 Precision rule |
| 05/19/1988 | DE3639477A1 Multipurpose straightedge (ruler) |
| 05/18/1988 | EP0267265A1 Framer |
| 05/10/1988 | US4742619 Marking tool with wear rims |
| 05/03/1988 | CA1235895A1 Hand tool |
| 04/1988 | |
| 04/13/1988 | CN87210175U Drawing-ruler |
| 04/13/1988 | CN87206817U Combination drawing rule of multiple functions |
| 04/12/1988 | US4736525 Floor square |
| 04/06/1988 | CN87202137U Length-adjustable and any angle-drawing ruler |
| 04/06/1988 | CN87202013U Ruler-type proportional scale |
| 04/05/1988 | US4734992 Drawing instrument |
| 03/1988 | |
| 03/30/1988 | CN87208835U Dotted line-drawing square |
| 03/29/1988 | US4733477 Chalk line framing square |
| 03/16/1988 | EP0259645A1 Drawing device |
| 03/09/1988 | CN87201091U T. square with a sliding calliper |
| 03/02/1988 | CN87207980U Ruler and protractor with arbitrary angle |
| 02/1988 | |
| 02/24/1988 | CN87206933U Multl-edge scale |
| 02/17/1988 | CN87206326U Proportional straightedge |
| 02/10/1988 | CN85203037U Multi-purpose ruler |
| 01/1988 | |
| 01/28/1988 | WO1988000564A1 Trace cutter for roll material |
| 01/27/1988 | CN87200251U Multifunction set square |
| 01/14/1988 | DE3720431A1 Parallel rule |
| 01/06/1988 | CN87202667U Student-used multipurpose folding drafting scale |
| 01/06/1988 | CN87202015U Multifunctional protractor |
| 12/1987 | |
| 12/30/1987 | CN87201113U Ruler for hatching and dotting |
| 12/29/1987 | US4715127 Ruler for measuring angles between an oriented axis and a vector |
| 12/26/1987 | CN87200057U Ruler with blade |
| 12/23/1987 | CN86206173U Plotting tool capable of spreading coordinate quickly |
| 12/22/1987 | US4713891 Column marker |
| 12/05/1987 | CN86210720U Drawing template |
| 12/05/1987 | CN86210448U Multi-purpose folding drawing rule |
| 12/05/1987 | CN86207050U Non-skid, easy-operating plastics t-square |
| 11/1987 | |
| 11/25/1987 | CN87201421U Set square capable of trisecting any angle |
| 11/25/1987 | CN87200096U Multifunction folding ruler |
| 11/24/1987 | US4707928 Graduated engineer/architect rule |
| 11/19/1987 | WO1987007108A1 Video production system and method |
| 11/19/1987 | WO1987006887A1 Framer |
| 11/07/1987 | CN86206410U Set square with a handhold |
| 11/04/1987 | CN87200952U Multipurpose carpenter's angle square |
| 10/1987 | |
| 10/31/1987 | CN86210459U T-square |
| 10/21/1987 | CN87200601U Movable ruler |
| 10/14/1987 | EP0241173A1 Drawing instruments |
| 10/14/1987 | CN87201084U Magnetically-combined ruler |
| 10/08/1987 | WO1987005863A1 Magnetically oriented draughting instrument |
| 09/1987 | |
| 09/09/1987 | CN86209463U Versatile engineering set sguare |
| 09/09/1987 | CN86207991U Versatile convex ruler |
| 09/02/1987 | CN86207874U Drawing set square |