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Title:
Electroacoustical system
United States Patent 3217080
Inventors:
Clark Jr., Melville
Publication Date:
11/09/1965
Assignee:
Clark Jr., Melville
Primary Class:
Other Classes:
84/707, 174/121SR, 369/60.01
International Classes:
G10K15/12; G10K15/08
View Patent Images:
Foreign References:
BE564517A
DE928351C