sound or for conversation between distant parties electrically insulated. third. the employment of a sound conductor, which is also an electrical conductor, as a means of communication by sound between distant points. fourth. the same in combination with provisions for electrically insulating the sending...
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crucible furnace with helical coils furnace top heated holding furnace electrically heated top heated holding furnace gas fired crucible type melting furnace reverbratory furnace for scrap melting scrap charging machines accessories reverbratory furnace these furnaces are suitable for hpdc / gdc shops...