Thermocouple calculator with centigrade to Fahrehe

Made:
1952-1960 in Philadelphia

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Thermocouple calculator with centigrade to Fahreheit converter by Leeds Northrup, 1952-60.

Details

Category:
Mathematics
Object Number:
1999-711
Materials:
card and complete
type:
ready reckoner (temperature)
credit:
Mr G. J. Betts