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US Patent: 1,902,542
Testing instrument and regulator
Patentee: Penrose E. Chapman (exact or similar names) - St. Louis, MO USPTO Classifications: 336/135 Tool Categories: electrical devices : electric or electronic testing apparatus Assignees: None Manufacturer: P. E. Chapman Electrical Works, Inc. - St. Louis, MO Witnesses: Unknown	Patent Dates: Applied: Sep. 16, 1929 Granted: Mar. 21, 1933 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for P. E. Chapman Electrical Works, Inc.
Description: Improvements to patent 1,759,479.

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