| Patents for B43L 13 - Drawing instruments, or writing or drawing appliances or accessories, not otherwise provided for (6,769) |
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| 09/25/1991 | CN2085310U Templets special for standard examination |
| 09/25/1991 | CN2085309U Protecting support for writing posture |
| 09/25/1991 | CN2085308U Set square combined with compasses and protractor |
| 09/25/1991 | CN2085307U Multifunctional set square for student's homework |
| 09/25/1991 | CN2085306U 多功能圆规 Multifunction Compass |
| 09/18/1991 | EP0446371A1 Writing utensil |
| 09/18/1991 | CN2084885U Divider set for arbitrary halving circle |
| 09/18/1991 | CN2084884U Posture corrector on writing |
| 09/18/1991 | CN2084883U Multifunction ruler |
| 09/18/1991 | CN1054560A Blind person writing unit |
| 09/11/1991 | CN2084430U Hard-pen character writing exercise copy-board |
| 09/11/1991 | CN2084429U Pen sleeve for drawing straight line |
| 09/11/1991 | CN2084318U Stationery box with electronic photo alarm |
| 09/10/1991 | US5046256 Method of connection drawing in automatic drafter |
| 09/10/1991 | CA1288798C Lap-oriented portable desk units |
| 09/04/1991 | CN2084012U Board for writing of children |
| 09/04/1991 | CN2084011U Stand for correnting writing posture of children |
| 09/04/1991 | CN1054217A Drawing instrument for drawing circular arc in perspective |
| 09/03/1991 | US5044804 Writing instrument |
| 09/03/1991 | US5044085 Table-top copying machine |
| 09/03/1991 | CA1288500C Sign generating apparatus |
| 09/03/1991 | CA1288240C Device and process for paper feed in a plastic drawing and cuttingflat plotter |
| 08/27/1991 | US5042155 Image forming member drive device of an automatic drawing apparatus |
| 08/21/1991 | CN2083118U Multi-functional reading or writing board capable of preventing myopia |
| 08/21/1991 | CN2083109U Forced posture-correcting pen |
| 08/14/1991 | EP0440635A1 A musician's stave scriber |
| 08/14/1991 | DE4003713A1 Pen recorder for measured values - has 2 movable pen carriages cooperating with recording sheet supported by slide=in carrier |
| 08/14/1991 | CN2082683U Anti-nearsightedness reading writing board |
| 08/14/1991 | CN2082682U Graduation drawing line device |
| 08/13/1991 | US5038483 Measuring gauge apparatus |
| 08/13/1991 | US5038482 Three-dimensional drawing device |
| 08/07/1991 | EP0439830A2 Web-processing device |
| 08/07/1991 | CN2082240U Pen for correcting words |
| 08/07/1991 | CN2082239U Multi-function plotting instrument |
| 08/06/1991 | USRE33654 Drafting device |
| 07/24/1991 | CN2081354U Correction pen |
| 07/24/1991 | CN2081351U Multi-purpose reading and writing health care instrument |
| 07/24/1991 | CN2081350U Multi-purpose three-core protractor |
| 07/24/1991 | CN2081349U Student studying posture correcting unit |
| 07/17/1991 | CN2080912U Pantograph for publishing charting |
| 07/17/1991 | CN2080911U Combined drawing rule |
| 07/16/1991 | US5031333 Template for theater lighting |
| 07/10/1991 | CN2080470U Multifunction triangle ruler |
| 07/10/1991 | CN2080469U Multifunction teaching ruler |
| 07/10/1991 | CN2080466U Board type copybook for calligraphy in writing brush |
| 07/03/1991 | CN2080030U Blind writing device |
| 07/03/1991 | CN1052632A Correct writing pen |
| 07/02/1991 | CA1285540C Moving node wave isolator for drafting plotter |
| 07/02/1991 | CA1285386C Automatic machine for drawing and ruling of plastic strips |
| 07/02/1991 | CA1285384C Draughting tables, drawing boards, drawing instruments and analogous apparatus |
| 06/26/1991 | EP0433521A1 Drafting instrument |
| 06/26/1991 | CN2079571U Drawing instrument for drawing cycle arc in perspective |
| 06/26/1991 | CN2079570U Healthy pen box |
| 06/26/1991 | CN2079569U Lined multipurpose scale |
| 06/26/1991 | CN2079568U Multipurpose protractor |
| 06/26/1991 | CN2079447U Stationery box with electronic eyesight protecting function |
| 06/25/1991 | US5027289 Method and device for controlling a plotter |
| 06/20/1991 | DE4036184A1 Automatic drawing machine with pencil lead transfer - provided by movement of guide unit to transfer from container pencil element |
| 06/20/1991 | DE4036183A1 Automatic drawing machine with pencil lead transfer - supplied from magazine by action of opening for liftable guide |
| 06/20/1991 | DE4036182A1 Automatic drawing machine with automati supply of pencil lead - provided from magazine accessed by moving pencil element underneath |
| 06/19/1991 | CN2079125U Building mine picture instrument |
| 06/19/1991 | CN2079124U Multi-purpose rule and guage |
| 06/19/1991 | CN2079123U Three purpose rule for student |
| 06/19/1991 | CN2079122U Drawing rule |
| 06/19/1991 | CN2079121U Multifunctional maths ruler |
| 06/12/1991 | CN2078694U Multi-purpose convenient pen receptacle |
| 06/06/1991 | DE4003001C1 Measurement disc for spectacles mfr. - is made using stylus fitted to tool carrier on lens edging device |
| 06/05/1991 | CN2078237U Multifunctioanl drawing board for students |
| 06/05/1991 | CN2078236U Multipurpose drawing instrument for drawing a plane |
| 06/05/1991 | CN2078232U Writing pen with spacing structure for holding |
| 05/29/1991 | CN2077803U Appliance for sketch drawing |
| 05/29/1991 | CN2077797U Drawing pen with coarse and fine common tip |
| 05/23/1991 | DE3938046A1 Arrangement for detecting and recording structure of objects - using source focused light producing light spot on object detector, recording medium for path of scanner-detector |
| 05/22/1991 | CN2077380U Complex drawing instrument for teaching |
| 05/21/1991 | US5017949 Table assembly for pattern drawing apparatus |
| 05/21/1991 | US5016357 Artwork analysis device |
| 05/15/1991 | EP0427466A2 Computer plotter control |
| 05/15/1991 | CN2076927U Infant drawing board |
| 05/15/1991 | CN2076926U Parallel multiple-surface rule |
| 05/15/1991 | CN2076925U Correction pen |
| 05/15/1991 | CN2076924U Combined type studying posture correcting device |
| 05/08/1991 | CN2076498U Arbitrary-angle board with angle nonius |
| 05/08/1991 | CN2076497U Multifunctional perspective board |
| 05/07/1991 | US5012586 Plotting and drafting apparatus with magnetic guide |
| 05/07/1991 | US5012584 Marking tool drive system for a drawing machine or similar type of machine |
| 05/01/1991 | CN2076035U Multifunction rolling drawing rule |
| 05/01/1991 | CN2076034U Equidistant ruler |
| 04/30/1991 | CA1283531C Drawing device for use in a drafting machine and a drawing pencil usedtherewith |
| 04/24/1991 | CN2075459U Multi-function stationery |
| 04/24/1991 | CN1050848A Drawing rule additional unit |
| 04/18/1991 | WO1991004873A1 Writing utensil |
| 04/17/1991 | CN2075148U 绘图机 Plotter |
| 04/17/1991 | CN2075016U Health pencil box |
| 04/12/1991 | WO1991005669A1 Three-dimensional drawing device |
| 04/10/1991 | EP0421818A2 Interactive computer graphics system for making precise drawings |
| 04/09/1991 | US5005296 Plotter and ink pressurizing pump |
| 04/09/1991 | CA1282587C Drafting device |
| 04/03/1991 | EP0419641A1 Computer output printer with plotter emulation |
| 04/03/1991 | EP0419588A1 Instrument for measuring angles and plotting with direct angle display and/or corresponding trigonometric values |
| 04/03/1991 | CN2074247U Serial quick drawing instrument |