Hearing aids /
Main Author: | |
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Format: | Government Document Book |
Language: | English |
Published: |
Washington :
U. S. Govt. Print. Off.,
1953
Washington : U.S. Govt. Print. Off, 1953 Washington, U.S. Govt. Print. Off., 1953 |
Series: | Circular of the Bureau of Standards ;
no. 534 Circular of the National Bureau of Standards ; 534 National Bureau of Standards circular ; 534 |
Subjects: |