Siemens and Halske, in Germany, produced their No. 100, a redesign of the No. 15 Teletype, using lighter and faster moving parts for operation at 100 words per minute. Among other improved features were a type bar shift to replace the platen shift for printing letters or figures, and a two-color ribbon which is automatically shifted to print in red or black to distinguish between sent and received messages—a feature of convenience in TELEX communication. The Siemens No. 100 was designed especially for the TELEX system, operating at 66 words per minute, where it is used extensively (fig. 17). [Illustration: Fig. 15 Teletype Corporation Model 28 100-words-per-minute Teletypewriter _Picture through courtesy of Teletype Corporation_] [Illustration: Fig. 16 Creed & Company Ltd. Model 75 Teleprinter with attachments _Picture by courtesy of Creed & Co. Ltd._] [Illustration: Fig. 17 Siemens & Halske Model 100 Teleprinter _Picture by courtesy of Siemens & Halske_] The Kleinschmidt printer, designed to operate at 100 to 150 words a minute, employs a new method for operating a typebar printing mechanism, comprising a type basket movable across the printed page and carrying the required set of type bars. Each type bar has a connected push rod extending to the rear of the type basket and is made operative to cause printing when a rotating finger, selectively positioned by a coded stop cage, is struck against the push rod. To meet the requirements of the Military for a teleprinter operable in any angular position, the letter spacing and carriage return with deceleration to the stop position is under positive control of the motor drive. [Illustration: Kleinschmidt Division of SCM Corporation AN/FGC-25 Send-Receive Fixed-Station Teletypewriter Set (used by the Military)] In 1948, scientists at Bell Telephone Laboratories, engaged in semiconductor research, announced the birth of their famous brainchild, the transistor. Now the little transistor and his friends, the diode and advanced techniques in electromagnetic inductive devices, have gradually taken over in the communications field, permitting startling speed increases and changes in equipment design.