Calibrator for two wire transmitters

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property

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D1004

Patent

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D02681730

REFERENCES:
patent: D249475 (1978-09-01), Turner
patent: D256896 (1980-09-01), Kuramoto
patent: 2875403 (1959-02-01), Gilbert
patent: 3622877 (1971-11-01), MacDavid
patent: 3701016 (1972-10-01), Bennett
North American Bulletin, 80.10-8/79-"Tech-Mate" Digital Calibrator.
Radio-Electronics-6/60, p. 100-Transfer Standard Calibrator.

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