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US Patent: 2,013,943
Circular Saw
Patentee: Henry B. Allen (exact or similar names) - Philadelphia, PA USPTO Classifications: 83/835 Tool Categories: woodworking machines : circular saws Assignees: Henry Disston & Sons, Inc. - Tacony, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 29, 1933 Granted: Sep. 10, 1935 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen. "Vintage Machinery" entry for Henry Disston & Sons
Description: Unevenly distributed slits on blade to prevent periodic vibrations from causing fatigue cracking.

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