Francis & Co
Subtitle: telegraph engineers, and sole manufacturers of the "improved railway block" and other telegraph instruments, electric bells, indicators, telegraphs, fire alarms, thief detectors, lightning conductors, clocks, etc., distant, semaphore, auxiliary & other signals for railways, materials for making all kinds of apparatus ...
Publisher: Francis & Co.
Published: 1871
Place of publication: London
Language: eng
Number of pages: 10
Notes: Cover title.