AE Step Base Candlestick
1911
Royal Swedish Telephone Switchboard
1910
Siemens & Halske Model 4088 (Railroad)
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About This Phone
In this specific model, the dual-crank system was a specialized feature for railway signaling. Because trains moved between stations, the two cranks allowed the operator to send distinct ringing signals—one to the station "up" the line and one "down" the line—without needing a complex switchboard.
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