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Watchmen's Time Detectors Operated by Batteries or Magneto Generators (1900)
Holtzer-Cabot Electric Company · Holtzer-Cabot Electric Company · leaf 76
SPEAKING TUBE WHISTLES. … Cat. No. 2315.Price per doz. . $3.00 Cat. No. 2394.Price per dozen . $3.00Furniture · Furnishing Accessories · Electrical engineering · Facility Electrical Power Generating and Storing Equipment · Battery Equipment · Clocks · Gongs · Electric bells · Annunciators · Alarms · Batteries · Motors · Fans
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
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