Perrygraf Alllied Parallel Resistor-Series Capacitor Calculator

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Country of manufacture: USA,            Date of manufacture: >1945
Overall length: 31.9 cm,          Width: 9.0 cm.,           
Materials: Cardboard shell with cardboard slide
Scales: specialized
Condition: C4-C5 (Signs of minimal to normal use)
Came with: Paper envelope wth instructions printed on it; one page instruction sheet

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