Search
Images
Maps
Play
YouTube
News
Gmail
Drive
More
»
Advanced Patent Search
|
Plain text
|
Web History
|
Sign in
Advanced Patent Search
Patents
www.google.com
http://www.google.com/patents/US174465?utm_source=gb-gplus-share
Patent US174465 - IMPROVEMENT IN TELEGRAPHY
IMPROVEMENT IN TELEGRAPHY
ALEXANDER GRAHAM BELL
Overview
Abstract
Drawings
Description
Claims
Patent number
: 174465
Issue date
: Mar 7, 1876
Plain text
PDF
