Special-service automatic telephone system
United States Patent 2298488

Inventors:
Glenn, Kiner
Saunders, Norman H.
Publication Date:
10/13/1942
View Patent Images:
Download PDF 2298488 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
KELLOGG SWITCHBOARD & SUPPLY
Primary Class:
379/37
International Classes:
H04M15/08