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The GNT Company originated as the Great Northern Telegraph Works, Copenhagen, Denmark. Keys were used under other names such as Sedgewall.

GNT Sedgewall Model 605

Sedgewall / GNT large straight Morse Telegraph Key 605. Originally designed and made in Denmark by the GNT / Great Northern Telegraph Works, Copenhagen, Denmark. (See pictures for details etc.) Labelled on the underside of the base is "605/IX 606/I-IX". The overall size of the key is about  8" by 3 & 1/2" (203mm by 90mm).

Reference Only

images courtesy of go-radio

GNT (Great Northern Telegraph) works of Denmark
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