Title:
Drafting instrument
United States Patent 2637110


Inventors:
Gilbertson, Harris S.
Application Number:
US16983850A
Publication Date:
05/05/1953
Filing Date:
06/23/1950
Assignee:
Gilbertson, Harris S.
Primary Class:
Other Classes:
33/565, D10/62, D10/64
International Classes:
B43L13/14
View Patent Images:
US Patent References:
D147705N/A
1667191Marine protractor1928-04-24
0960196N/A1910-05-31
0387966N/A1888-08-14
0371741N/A1887-10-18
Foreign References:
GB190407653A1905-02-09
CH84466A1920-03-16
CH245102A1946-10-31
GB367211A1932-02-18