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US Patent: 815,381
Combination-tool
Patentee:
Peter L. Robertson (exact or similar names) - Canfield, ON Canada

USPTO Classifications:
7/140, 81/437, 81/73

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Mar. 20, 1906

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Description:
The inventor also invented the Robertson (square-drive) screw and its associated driver.

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