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Title: Bright's patent Relay and Switch for indicating stations whe [Go to resource]
Description: Bright's patent Relay and Switch for indicating stations where fire-alarm is sounded, 1878 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1878 Source: Science Museum Creator: Bright (maker) Identifier: 1909-111 Go to resource More Like this...
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