Noise reducing means for cabin aircraft
United States Patent 2122447
Inventors:
Zand, Stephen J.
Publication Date:
07/05/1938
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Assignee:
SPERRY GYROSCOPE CO INC
Primary Class:
Other Classes:
138/DIG.004, 181/212, 237/12.30A, 244/119
International Classes:
B64C1/40; B64C1/00