Rare Books
Extracting copper from ores : Specification forming part of Letters patent no.227,902,dated May 25th, 1880
Image not available
You might also be interested in
Image not available
A new process for the extraction of copper from its ores : with notes on the treatment of gold and silver ores
Rare Books
266170
Image not available
Telephone-exchange system. : Specification forming part of Letters Patent No. 299,070, dated May 20, 1884
Rare Books
753216
Image not available
Telephone signaling apparatus. : Specification forming part of Letters Patent No. 289,834, dated December 11, 1883
Rare Books
753214
Image not available
Telephone-exchange system. : Specification forming part of Letters Patent No. 292,115, dated January 15, 1884
Rare Books
753215
Image not available
Electric signaling apparatus. : Specification forming part of Letters Patent No. 314,292, dated March 24, 1885
Rare Books
753219
Image not available
Electric signaling apparatus. : Specification forming part of Letters Patent No. 573,221, dated December 15, 1896
Rare Books
753226