| Patents for B43L 7 - Straightedges (3,964) |
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| 07/19/2000 | CN2388584Y Ruler for drawing map |
| 07/06/2000 | DE19859410A1 Multiple ruler for drawing lines or banding and scratching, with slot off center parallel to long edge, bounded by endfaces of connecting webs |
| 06/21/2000 | CN2383697Y 2-D positioning ruler |
| 06/21/2000 | CN2383696Y Multifunctional scale |
| 06/21/2000 | CN2383695Y Multifunctional drawing instrument |
| 06/15/2000 | WO2000034052A1 Drawing instrument |
| 05/24/2000 | CN2379321Y Multi-functional ruler |
| 05/17/2000 | CN1253529A Flat instrument in particular for tracing or cutting out geometrical shapes |
| 04/26/2000 | CN2375475Y Set square with angle indicator |
| 04/26/2000 | CN2375474Y Small T-square |
| 04/21/2000 | CA2250553A1 Power saw cutting guide square |
| 04/18/2000 | US6049990 Multifunction layout tool |
| 04/12/2000 | CN2373282Y Multifunction angle drawing appliance |
| 03/22/2000 | CN2369875Y Multifunctional flexible rule |
| 03/15/2000 | CN2368718Y Movable aided ruler for writing |
| 03/15/2000 | CN2368717Y Convenient ruler |
| 03/15/2000 | CN2368716Y Printing ruler |
| 03/08/2000 | CN2367476Y Multiple-purpose combined ruler for students in middle school |
| 03/01/2000 | CN2366824Y Laser level scale |
| 03/01/2000 | CN2366289Y Triangle calculating combination ruler |
| 03/01/2000 | CN2366288Y Square for drawing any degree of angles |
| 02/16/2000 | CN2364429Y Compasses, ruler device |
| 02/16/2000 | CN2363896Y Zigzag rule |
| 02/10/2000 | DE19835040A1 Protective device for guiding edges of transparent drawing aid, in which guiding edges are made of more wear-resistant material than body of aid |
| 02/02/2000 | CN2361485Y Multi-functional angulometer with folding rule |
| 01/27/2000 | DE19817240C1 Measurement scale for producing plans or technical drawings |
| 01/26/2000 | CN2360836Y Lattice rule |
| 01/26/2000 | CN2360835Y Foldable multifunctional student's ruler |
| 01/12/2000 | EP0969974A1 Flat instrument in particular for tracing or cutting out geometrical shapes |
| 01/12/2000 | CN2357928Y Multifunctional teaching triangle |
| 01/12/2000 | CN2357927Y Ruler instrument for drawing |
| 01/05/2000 | DE19926737A1 Ruler for drawing lines on sheet of paper or for use as cutting guide |
| 12/29/1999 | CN2356308Y 组合尺 Combination foot |
| 12/29/1999 | CN2355894Y Multifunctional tool rule for measuring and drawing |
| 12/15/1999 | CN2353559Y Variable multipurpose ruler |
| 12/15/1999 | CN2353558Y Multifunction ruler |
| 12/15/1999 | CN2353557Y Multipurpose angle gauge |
| 12/08/1999 | CN2353006Y Adjustable multi-purpose for rod ruler |
| 12/01/1999 | CN2351296Y Polygon drawing instrument |
| 11/10/1999 | CN2347784Y 'Taiji' divider triangulator |
| 11/03/1999 | CN2346600Y Direct-viewing drawing board |
| 11/02/1999 | US5974677 Layout tool for laying out perpendicular lines |
| 10/27/1999 | CN2345366Y Spot type multifunction quick drawing instrument |
| 10/20/1999 | CN2344189Y Multi-purpose drawing rule |
| 10/14/1999 | WO1999051448A1 Layout tool for laying out perpendicular lines |
| 09/29/1999 | CN2340625Y Multifunctional mathmatical ruler |
| 09/15/1999 | CN2338177Y Multi-functional ruler with arrangement for attaching additional drawing equipment e. g. for chequers |
| 09/08/1999 | CN2336979Y Multi-function drawing instrument |
| 09/01/1999 | CN2335798Y Multifunctional set square |
| 08/18/1999 | CN2334011Y Multi-purpose angle gauge |
| 08/18/1999 | CN2333549Y Image-measuring special ruler for medical iconography |
| 07/28/1999 | CN2330524Y Multipurpose rule gage |
| 07/28/1999 | CN2330512Y Book reading card |
| 07/21/1999 | CN2329532Y Instrument for evenly dividing arbitrary angle to three angles |
| 06/29/1999 | US5915806 Multi-function square |
| 06/09/1999 | CN2322801Y Multifunctional ruler for blackboard newspaper |
| 06/09/1999 | CN2322800Y 多功能尺 Multifunction foot |
| 05/19/1999 | CN2319229Y Combination plotter |
| 04/29/1999 | DE19747193A1 Set square with integrated compasses |
| 04/28/1999 | CN2316145Y Multifunction ruler |
| 04/21/1999 | CN2314953Y 尺子铅笔刨 Ruler Pencil Sharpener |
| 04/20/1999 | US5894675 Combination tool |
| 04/15/1999 | DE19831113A1 Drawing aid |
| 03/17/1999 | CN2310680Y Multifunctional drawing rule |
| 03/17/1999 | CN2310679Y Wear-resistant drawing rule capable of preventing from being tainted with ink |
| 02/23/1999 | US5873171 Ruler assembly |
| 02/16/1999 | US5870831 Ceramic and marble wall-cut measuring ruler |
| 02/10/1999 | CN2306892Y Simple multipurpose drawing rule |
| 02/02/1999 | US5864959 Drawing triangle and/or protractor, in particular for blackboard use |
| 01/26/1999 | US5862601 Tracing tool |
| 01/19/1999 | CA2136398C Measuring and drawing instrument |
| 12/16/1998 | CN2300521Y Drafting teaching-aid capable of absorbing on steel blackboard |
| 12/16/1998 | CN2300520Y Measuring-drawing combined drawing instrument |
| 12/09/1998 | CN2299723Y Multi-functional ruler |
| 11/25/1998 | CN2298143Y Multipurpose ruler |
| 11/24/1998 | US5839201 Segmented, combination level and square having a rotating joint |
| 11/11/1998 | CN2296825Y Multipurpose ruler |
| 11/04/1998 | CN2296276Y Multifunctional drawing set square |
| 10/28/1998 | CN2295608Y Multifunctional drawing ruler |
| 10/21/1998 | CN2294853Y Uniform ruler |
| 10/15/1998 | WO1998045126A1 A segmented, combination level and square having a rotating joint |
| 10/07/1998 | CN2293458Y Device for opening envelope |
| 10/01/1998 | WO1998042521A1 Flat instrument in particular for tracing or cutting out geometrical shapes |
| 10/01/1998 | CA2283711A1 Flat instrument in particular for tracing or cutting out geometrical shapes |
| 09/30/1998 | CN2292681Y Multifunctional triangle |
| 09/30/1998 | CN2292680Y Drawing device with plural straightedges relatively movable |
| 09/23/1998 | CN2292028Y Square rule |
| 09/16/1998 | CN2291313Y Multi-functional drawing-board |
| 08/26/1998 | CN2288851Y 组合尺 Combination foot |
| 08/26/1998 | CN2288850Y Multifunctional trinagle for drawing |
| 08/12/1998 | CN2287575Y Three-in-one ruler |
| 08/05/1998 | EP0855961A1 Combined protractor, compass, ruler and set square device |
| 07/29/1998 | CN2286677Y Angle gauge ruler drawing board |
| 06/30/1998 | US5771598 Measurement device with British/metric scales |
| 06/03/1998 | CN2282990Y Folding rule |
| 06/03/1998 | CN2282989Y Rule for basic mathematics |
| 05/20/1998 | CN2281902Y Mutifunctional profile survey and drawing rule |
| 05/12/1998 | US5749154 Bull nose corner marking apparatus |
| 05/12/1998 | US5749153 Wallboard T-square with sharpener |
| 04/08/1998 | CN2277891Y Multi-purpose drawing rule |