GB2249058B - Improvements in or relating to mathematical instruments - Google Patents

Improvements in or relating to mathematical instruments

Info

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
Application number
GB9108704A
Other versions
GB2249058A (en
GB9108704D0 (en
Inventor
Andrew Brennan Bones
Timothy Alfred Redding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Helix Ltd
Original Assignee
Helix Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB9019711A external-priority patent/GB2248212B/en
Priority claimed from GB9027937A external-priority patent/GB2250959B/en
Priority claimed from GB919106889A external-priority patent/GB9106889D0/en
Application filed by Helix Ltd filed Critical Helix Ltd
Publication of GB9108704D0 publication Critical patent/GB9108704D0/en
Publication of GB2249058A publication Critical patent/GB2249058A/en
Application granted granted Critical
Publication of GB2249058B publication Critical patent/GB2249058B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
GB9108704A 1990-09-08 1991-04-23 Improvements in or relating to mathematical instruments Expired - Lifetime GB2249058B (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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