TY  - BOOK
AU  - Henney,Keith
TI  - Electron tubes in industry
AV  - QC544.V3 H4 1937
U1  - 537.53 
PY  - 1937///
CY  - New York, and London
PB  - McGraw-Hill book company, inc.
KW  - Vacuum tubes
KW  - Local
N1  - Includes bibliographies
ER  -