Perrygraf ARRL L/C/F Calculator & Coil Winding Calculator

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Country of manufacture: USA,            Date of manufacture: >=1969
Overall length: 25.4 cm,          Width: 10.2 cm.           
Materials: Cardboard shell with cardboard slide
Scales: 11, specialized
Front: [ Wavelength, Frequency ] [ Inductance ] Capacitance, Centimeters, Inches
Back: Coil Diameter [ Coil length } Turns per Inch [Inductance ] Enameled Wire Size
Condition: C3-C4 (Signs of very minimal to minimal use)
Came with: nothing

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