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US Patent: 2,642,848
Air Valve Mechanism for Controling the Operation of Pneumatic Devices and the Like
Patentees: George M. Walraven (exact or similar names) - Kenosha, WI Raymond G. Knudsen (exact or similar names) - Kenosha, WI USPTO Classifications: 91/226, 91/229 Tool Categories: Assignees: Snap-On Tools Corp. - Kenosha, WI Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Sep. 23, 1947 Granted: Jun. 23, 1953 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Stan Schulz Snap-On Tools Company History
Description: Harry C. Alberts - patent attorney

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