Invention Grant
- Patent Title: Plotting instrument
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Application No.: US38072229Application Date: 1929-07-24
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Publication No.: US1933835APublication Date: 1933-11-07
- Inventor: ALEXANDER WILLIAM D
- Applicant: ALEXANDER WILLIAM D
- Assignee: William D Alexander
- Current Assignee: William D Alexander
- Priority: US38072229 1929-07-24
Information query
