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US Patent: 811,175
Level
Patentee: John Thompson Rider (exact or similar names) - Oil City, PA USPTO Classifications: 33/390 Tool Categories: layout tools : levels Assignees: None Manufacturer: Not known to have been produced Witnesses: George W. Moore Dan B. Goodwin	Patent Dates: Applied: Nov. 10, 1904 Granted: Jan. 30, 1906 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Utilizes a unique rectangular or square shaped level vial which allows both level and plumb measurements using one vial.

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