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US Patent: 715,194
Combined Rule and Square
Patentee:
Pickette M. Callahan (exact or similar names) - Denver, CO

USPTO Classifications:
33/496

Tool Categories:
rules : folding rules : folding rule joints

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Dena Nelson
Ida E. O'Brien
Patent Dates:
Granted: Dec. 02, 1902

Patent Pictures:
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