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US Patent: 2,646,687
Helical shaft machine
Patentee:
William E. De Wald (exact or similar names) - Chicago, IL

USPTO Classifications:
408/121, 408/124, 74/127

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Jul. 28, 1953

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward George Langford
Description:
Only 14 pages of drawings and specifications. Probably never sold a single one.

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