TY  - BOOK
AU  - Robertson,A.E.
TI  - Microphones
U1  - 621.384133 
PY  - 1963///
CY  - London
PB  - Iliffe books
KW  - Microphone
KW  - Sound
KW  - Equipment and supplies
KW  - Transducers
KW  - Electro static microphone
N1  - Includes index
ER  -