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http://www.google.com/patents/US2599357?utm_source=gb-gplus-share
Patent US2599357 - AUTOMATIC TELEPHONE BILLING SYSTEM
AUTOMATIC TELEPHONE BILLING SYSTEM
C. E. BROOKS et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2599357
Filing date
: Feb 23, 1946
Issue date
: Jun 3, 1952
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