Category:Hydraulic telegraph

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Telégrafo hidráulico (es); 水圧通信 (ja); hydraulic telegraph (en); Водяной телеграф (ru); 液壓電報 (zh); Υδραυλικός Τηλέγραφος (el) Telegrafo hidráulico, Telegrafo hidraulico, Telégrafo hidraulico (es)

Hydraulic telegraph

Media in category "Hydraulic telegraph"

The following 3 files are in this category, out of 3 total.