Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,386 pages of information and 233,857 images on early companies, their products and the people who designed and built them.

Gotthief Angarius Betulander

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Swedish electrical engineer.

Developed the Betulander (Relay) Automatic Telephone System working in the Swedish Post Office using electro-magnetic relays for switching, a different concept from the electro-mechanical type of switch used in the Strowger system.

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