Silver Spring, MD
NEMS-Clarke, aka Vitro Corporation, built monitoring and test equipment for RCA - and marketed the product on their own as well.
The original companies NEMS - National Electric Machine Shop (founded 1899 as National Electrical Supply Co) - and Clarke Instruments (founded 1940), merged in 1951 as NEMS-Clarke. NEMS was manufacturing radio parts, and Clarke designed telemetry and special purpose receivers, largely for the Defense Department.
In 1957, Vitro bought NEMS-Clarke and moved it to Silver Spring, MD. In 1981, Vitro was acquired by Penn Central Corp.
In 19xx, Potomac Instruments bought what was left of NEMS-Clarke and serviced the products, until parts ran out. At last report, PI no longer even offers calibration for NEMS-Clarke products, however, some information may be available at PI.
|107-A Field Intensity Meter|
|120-D Field Intensity Meter|
|120-E Field Intensity Meter|
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