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US Patent: 339,369
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Patentee: George Blythe (exact or similar names) - Chillicothe, MO USPTO Classifications: 33/379 Tool Categories: layout tools : levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Robt. S. Moore W. H. Booth	Patent Dates: Applied: Aug. 11, 1885 Granted: Apr. 06, 1886 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Cover plate has two notches cut out to help prevent the cover from casting a shadow on the vial and bubble.

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