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US Patent: 1,309,489
Double-Gyro Inclinometer
Patentee: Lawrence B. Sperry (exact or similar names) - Brooklyn, NY USPTO Classifications: 33/328, 74/5.37 Tool Categories: layout tools : levels : inclinometers Assignees: Sperry Gyroscope Company - Brooklyn, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 18, 1918 Granted: Jul. 08, 1919 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is an inclinometer that uses a gyroscope to set the level, making it suitable for use in airplanes.

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