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US Patent: 1,591,540
Crank-case venting means for pneumatic tools
Patentees:
Axel Levedahl (exact or similar names) - Aurora, IL
Reinhold A. Norling (exact or similar names) - Aurora, IL

USPTO Classifications:
184/55.1, 184/6, 74/603, 74/605, 92/78, 92/82

Tool Categories:

Assignees:
None

Manufacturer:
Independent Pneumatic Tool Co. - Aurora, IL

Witnesses:
Unknown

Patent Dates:
Applied: Nov. 08, 1923
Granted: Jul. 06, 1926

Patent Pictures:
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Vintage Machinery entry for Thor Power Tool Co.

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