TY  - BOOK
AU  - COURSEY PHILIP R
TI  - TELEPHONY WITHOUT WIRES
U1  - PE79 
PY  - 1919///
CY  - LONDON 
PB  - THE WIRELESS PRESS 
N1  - PE mean Physics, Electricity and Magnetism Page 450-456 in A to Z Register (Acc. No. Pe1-Pe205)
ER  -