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US Patent: 1,487,381
Adjustable Grooving Device
Patentee: Authur J. Helms (exact or similar names) - Portland, OR USPTO Classifications: 30/503.5, 7/148 Tool Categories: woodworking tools : handsaws : backsaws layout tools : special purpose gauges Assignees: Edward J. Vennewitz - Portland, OR Authur J. Helms - Portland, OR Manufacturer: Not known to have been produced Witnesses: Hubert A. Cooke Grace Reed	Patent Dates: Applied: Dec. 09, 1922 Granted: Mar. 18, 1924 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Handsaw with two saw blades coupled with a gage to enable measured dados to be cut to a specified depth.

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