Circular slide rule, cardboard, for acoustical cal

Made:
1949 in Illinois

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Circular slide rule, cardboard, for acoustical calculations: Masco "Sound Surveyor" made 1949 by Perrygraf, Illinois for Mark Simpson Manufacturing Company, New York

Details

Category:
Mathematics
Object Number:
1985-277
type:
circular slide rule (acoustics)
credit:
Crosby, R.C.