US Patent: 2,642,848
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| Air Valve Mechanism for Controling the Operation of Pneumatic Devices and the Like
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Patentees:
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| George M. Walraven (exact or similar names) - Kenosha, WI |
| Raymond G. Knudsen (exact or similar names) - Kenosha, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 23, 1947 |
| Granted: |
Jun. 23, 1953 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Harry C. Alberts - patent attorney
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