 | P. J. Povey, Reg A. J. Earl - Business & Economics - 1988 - 220 pages
Experimental telephones / Bell and Edison / improved speaking and listening / electrophone / coinbox / early telephones from France, Sweden and Germany / first British post ... | |
 | P. J. Povey, Reg A. J. Earl - Business & Economics - 1988 - 220 pages
Experimental telephones / Bell and Edison / improved speaking and listening / electrophone / coinbox / early telephones from France, Sweden and Germany / first British post ... | |
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