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http://www.google.ca/patents/US3750167?utm_source=gb-gplus-share
Patent US3750167 - POSTAL TRACKING SYSTEM
POSTAL TRACKING SYSTEM
A. Herlkh; Seigfried Mikuteit et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3750167
Filing date
: 22 Jul 1971
Issue date
: 1973
Plain text
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