Hearing aids [by] Edith L.R. Corliss.
Edition: [Rev.]
Series: National Bureau of Standards monograph 117
Publisher: U.S. National Bureau of Standards; for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1970
Place of publication: Washington
Language: eng
Number of pages: 24
Subjects: Hearing aids, Mechanical