About Howell Instruments Inc
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TEMPCAL by HOWELL INSTRUMENTS, INC. (Track this)
Intl: (009) Electrical and scientific apparatus US: 026 Filing date: 29-Nov-1954 Serial number: 71677380
JETCAL by HOWELL INSTRUMENTS, INC. (Track this)
Intl: (009) Electrical and scientific apparatus US: 026 Filing date: 29-Nov-1954 Serial number: 71677379