Title:
Telephone advertising method and apparatus
United States Patent 1958896

Inventors:
Lawrence, Lesavoy Isadore
Koenigsberg, Sanford Z.
Publication Date:
05/15/1934
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Assignee:
Lawrence, Lesavoy Isadore
Koenigsberg, Sanford Z.
Primary Class:
379/84
Other Classes:
379/72
International Classes:
H04M1/65