| Patents for B43L 7 - Straightedges (3,964) |
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| 05/08/1984 | US4446627 Arrangement in angle rulers for improving fixture of an angularly adjustable blade of said rulers to the stock thereof in selected blade positions relative thereto |
| 04/24/1984 | US4443953 Handle for a drafting instrument |
| 04/03/1984 | US4439928 Drafting instrument |
| 03/13/1984 | US4435904 Automated measuring scale |
| 03/13/1984 | CA1163437A1 Joint square and divider |
| 02/08/1984 | EP0100298A1 Device for moving technical drawing means when making a repetitive drawing or transfer of adhesive foils |
| 01/10/1984 | CA1160040A1 Tool for locating the centre of a circle |
| 12/27/1983 | US4422245 Tripod open throat T-square and drafting board |
| 12/20/1983 | US4420891 Framing and layout square |
| 09/20/1983 | US4404753 Carpenter's saw guide and square |
| 06/21/1983 | US4388764 Template guide |
| 05/10/1983 | US4382340 Straight edge device |
| 03/02/1983 | EP0072791A1 Assembly for drawing lines in a given direction |
| 03/02/1983 | EP0072790A1 Device for drawing equidistant,parallel lines |
| 01/25/1983 | US4369583 Plotting device |
| 01/25/1983 | CA1139933A1 Retractable-pin stabilizers on a wallboard t-square |
| 11/24/1982 | EP0065375A1 Set square |
| 11/23/1982 | US4359825 Drafting machine attachment |
| 11/17/1982 | EP0064503A1 Ruler with measuring memories |
| 11/16/1982 | US4358898 Protractor |
| 11/10/1982 | EP0064152A1 Device for affixing drawing aids, e.g. to the ruler support of a drawing machine |
| 10/26/1982 | US4355472 Drafting aid |
| 10/05/1982 | US4352247 Square level for drawing angles and parallels |
| 09/21/1982 | US4349966 Cutting guide and measuring device |
| 09/14/1982 | US4348815 Multi-purpose square |
| 09/02/1982 | WO1982002856A1 Device for drawing equidistant,parallel lines |
| 09/02/1982 | WO1982002855A1 Assembly for drawing lines in a given direction |
| 08/24/1982 | US4345383 Designer's triangle |
| 06/01/1982 | CA1124510A1 Measuring and draughting instrument with telescopic extension |
| 05/27/1982 | WO1982001686A1 Ruler with measuring memories |
| 02/23/1982 | US4316330 Magnifying device for use with a triangular rule |
| 02/16/1982 | CA1118196A1 Cutting guide square |
| 02/09/1982 | US4314408 Combination drafting instrument including rotatable scales, compass assembly and straight edge magnifier |
| 01/26/1982 | US4312133 T-Square |
| 11/24/1981 | US4301600 Locating mechanism |
| 07/21/1981 | US4279081 Wallboard T-square |
| 01/20/1981 | US4245394 Clamping device for straight edge |
| 01/13/1981 | US4244119 Protractable straight-edge with vise |
| 11/25/1980 | US4235022 Device for linear drawing |
| 11/12/1980 | EP0018657A1 Set-square for dividing angles and tracing parallels |
| 07/01/1980 | CA1080468A1 Graduated ruler with perspective scales |
| 06/24/1980 | US4208804 Ruler means for dividing a distance |
| 06/03/1980 | US4205450 Drafting instrument for perspective drawing and other uses |
| 05/13/1980 | US4202105 Brush guide |
| 04/15/1980 | US4197649 Linear marking device |
| 07/31/1979 | US4162578 T-square |
| 05/22/1979 | US4155165 Picture mat marking instrument |
| 08/15/1978 | US4106201 Tape measure |
| 06/20/1978 | US4095346 Pipefitting square |
| 06/20/1978 | US4095345 Straight edge assembly |
| 05/09/1978 | US4087917 Positively positionable ruler |
| 02/21/1978 | US4075467 Illuminated drafting instrument |
| 01/24/1978 | US4069560 Measuring apparatus |
| 12/06/1977 | US4060902 Multi-purpose tool |
| 08/30/1977 | US4044469 Multi-function measuring instrument |
| 07/12/1977 | US4034943 Welder's square supporting assembly |
| 06/14/1977 | US4028814 Pivoting rule |
| 06/07/1977 | US4027396 Marking gauge for measuring and marking French mats |
| 05/24/1977 | US4024831 Transparent ruler having longitudinally positioned colored area for isolating rows of symbols for rapid scanning |
| 01/25/1977 | US4004347 Graphics instrument |
| 11/16/1976 | US3991474 Measurement tool |
| 09/07/1976 | US3978587 Drafting system and apparatus |
| 08/24/1976 | US3975827 Measuring apparatus |
| 04/13/1976 | US3949481 Layout instrument for sheet-material fabrication |