1. #Telephony and telegraphy
Author: #by Sydney F. Smith
Library: Central Library of Esfehan University of Technology (Esfahan)
Subject: Telephone ،Telegraph
Classification :
#
TK
،#.
S6
،#
1978
2. Telephony & telegraphy A: an introduction to telephone and telegraph instruments and exchanges
Author: Smith, Sydney F
Library: Central Library of Sharif University of Technology (Tehran)
Subject: ، Telephone,، Telegraph
Classification :
TK
6161
.
S6
3. Telephony & telegraphy:an introduction to instruments & exchanges
Author: SMITH,SYDNEY F
Library: Central Library of Amirkabir University of Technology (Tehran)
Subject: TELEPHONE , TELEGRAPH
Classification :
TK
6161
.
S6
1974
