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US Patent: 3,939,925
Throttle valve construction for percussion tool
Patentee: Irvin R. Danielson (exact or similar names) - Burr Ridge, IL USPTO Classifications: 173/170, 173/18, 251/120 Tool Categories: Assignees: Thor Power Tool Co. - Aurora, IL Manufacturer: Thor Power Tool Co. - Aurora, IL Witnesses: Unknown	Patent Dates: Applied: Jan. 21, 1974 Granted: Feb. 24, 1976 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Thor Power Tool Co.
Description: "A throttle valve construction for a pneumatic paving breaker and other types of percussion tools employing a reciprocating piston..."

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