technology,telephone,one of the first wall-mounted,version OB 1882,OB is the acronym for the term local battery,battery provided the electric power for the integrated microphone of the American Blake Company,still only four copies existing,Germany,1882,exhibit at telephone museum Morbach,microphone,microphones,public telephone,wooden chassis,wooden case,wood,wooden,very early telephone,wall-mounted device,telephone,phone,telephones,phones,telephone receiver,telephone receivers,invention,inventions,rarity,rarities,engineering,techno,Additional-Rights-Clearences-Not Available

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Keywords: 19th, antique, antiques, antiquities, antiquity, case, century, chassis, clipping, cut, cut-, cut-outs, device, early, engineering, historic, historical, history, invention, inventions, microphone, microphones, ob, phone, phones, public, rarities, rarity, receiver, receivers, technical, technics, technologies, technology, telephone, telephones, version, wall-mounted, wood, wooden