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US Patent: 310,154
Spirit Level
Patentee: Benjamin F. Tyler (exact or similar names) - Salem, NJ USPTO Classifications: 33/349, 33/379 Tool Categories: layout tools : levels Assignees: None Manufacturer: Not known to have been produced Witnesses: J. M. Lippincott George Hitcraft	Patent Dates: Applied: Jul. 31, 1884 Granted: Dec. 30, 1884 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Sliding bar is used to mark the level position desired.

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