- Back
-
Title: "Hall Mark" continuous contact electric copier patent No [Go to resource]
Description: "Hall Mark" continuous contact electric copier patent No. 170967 made by B.J. Hall & Co. Ltd., London, c. 1925. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1925 Source: Science Museum Creator: Hall, B.J. (maker) Identifier: 1982-497 Go to resource More Like this...
[Edit] - Back