An experimental study of the relationship between circuit loads and delay to traffic. (1600 w.) (No. 53000 D)
Toll telephone traffic
Aufsatz (Zeitschrift)
Sources of toll traffic in Dutch full automatic telephone system
Engineering Index Backfile | 1949
|Toll-telephone question in Finland
Engineering Index Backfile | 1934
|Testing toll and rural telephone lines
Engineering Index Backfile | 1930
|Telephone toll plant in the Chicago region
Engineering Index Backfile | 1928
|Telephone toll plant in the Chicago region
Engineering Index Backfile | 1929
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