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US Patent: 1,288,556
Interlocking Slidable Sections Interlox Rule
Patentee: Herman Gasstrom (exact or similar names) - New York, NY USPTO Classifications: 33/809 Tool Categories: rules : folding rules : folding rule joints Assignees: Dahl Mfg. Co. - New York, NY Manufacturer: Master Rule Mfg. - New York, NY Witnesses: Robert Richter Fred F. Weiss	Patent Dates: Applied: Jan. 31, 1916 Granted: Dec. 24, 1918 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Sliding interlocking sections that lock in both the open and extended positions. Mr. Gasstrom lists himself as a subject of the Czar of Russia in his application.

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