GB2249058B - Improvements in or relating to mathematical instruments - Google Patents
Improvements in or relating to mathematical instrumentsInfo
- Publication number
- GB2249058B GB2249058B GB9108704A GB9108704A GB2249058B GB 2249058 B GB2249058 B GB 2249058B GB 9108704 A GB9108704 A GB 9108704A GB 9108704 A GB9108704 A GB 9108704A GB 2249058 B GB2249058 B GB 2249058B
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- mathematical instruments
- mathematical
- instruments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K31/00—Writing implement receptacles functioning as, or combined with, writing implements
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9019711A GB2248212B (en) | 1990-09-08 | 1990-09-08 | Drawing instrument |
GB9027937A GB2250959B (en) | 1990-12-21 | 1990-12-21 | Geometrical drawing instrument |
GB919106889A GB9106889D0 (en) | 1991-04-02 | 1991-04-02 | Improvements in or relating to mathematical instruments |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9108704D0 GB9108704D0 (en) | 1991-06-12 |
GB2249058A GB2249058A (en) | 1992-04-29 |
GB2249058B true GB2249058B (en) | 1993-04-07 |
Family
ID=27265255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9108704A Expired - Lifetime GB2249058B (en) | 1990-09-08 | 1991-04-23 | Improvements in or relating to mathematical instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2249058B (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4203227A (en) * | 1978-05-19 | 1980-05-20 | Hector Giroux | Telescopic straight edge |
US4451993A (en) * | 1983-07-05 | 1984-06-05 | Yauk Alvin R | Sliding rule and protractor |
US4700491A (en) * | 1986-02-12 | 1987-10-20 | Rhea Jr Troy E | Color-coded ruler for three-phase wiring |
-
1991
- 1991-04-23 GB GB9108704A patent/GB2249058B/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4203227A (en) * | 1978-05-19 | 1980-05-20 | Hector Giroux | Telescopic straight edge |
US4451993A (en) * | 1983-07-05 | 1984-06-05 | Yauk Alvin R | Sliding rule and protractor |
US4700491A (en) * | 1986-02-12 | 1987-10-20 | Rhea Jr Troy E | Color-coded ruler for three-phase wiring |
Also Published As
Publication number | Publication date |
---|---|
GB2249058A (en) | 1992-04-29 |
GB9108704D0 (en) | 1991-06-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Expiry date: 20110422 |