COURSEY PHILIP R <br/><br/>
TELEPHONY WITHOUT WIRES 
PHILIP R. COURSEY  
 - LONDON   THE WIRELESS PRESS   1919 
 - 413PAGES 
<br/><br/> PE mean Physics, Electricity and Magnetism Page 450-456 in A to Z Register (Acc. No. Pe1-Pe205) 
<br/><br/><label>Dewey Class. No.: </label>PE79