Home| FAQSearch:Advanced|Person|Company| Type|ClassLogin
Quick search:
Patent number:
Patent Date:
All Patents in class 181/138
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
218,707Aug. 19, 1879M.J. Maxwell, C.H. BillingsImprovement in mechanical telephonescommunication apparatus
243,214Jun. 21, 1881I.W. Colburn, H.J. ColburnAcoustic telephonecommunication apparatus
Toggle print mode
Show pictures

Copyright © 2002-2024 - DATAMP