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US Patent: 2,403,809
Frequency meter
Patentee:
Frederick J. Lingel (exact or similar names) - Bluffton, OH

USPTO Classifications:
324/76.49

Tool Categories:
electrical devices : electrical measuring apparatus

Assignees:
Ray L. Triplett - Bluffton, OH

Manufacturer:
JBT Instruments, Inc. - New Haven, CT

Witnesses:
Unknown
Patent Dates:
Applied: Aug. 22, 1941
Granted: Jul. 09, 1946

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
YouTube (oxtoolco) video showing a JBT frequency meter
Description:
An example has been seen bearing this patent number. This model 34-FHXX-Z-11 meter displays AC line frequency over a range of about 58 to 62 Hertz.

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