Police Signaling and Telephoning at Pan-American Exposition - Fig. 1. Central Office Equipment in Service Building

"Police Signaling and Telephoning at Pan-American Exposition"
Fig. 1. Central Office Equipment in Service Building

Photo credit: n/a.
Source: Western Electrician, v.29, no.21 (Nov. 23, 1901) p. 341.

Fig. 1. Central Office Equipment in Service Building

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