21. In November 1957 the first of several transistorized Trans-Oceanics was introduced, the Royal 1000. 22. This contributed to the financial success of the IBM 1400 and 7000 series of transistorized computer products. 23. In addition, the camera was fully transistorized , apart from the four pick-up tubes. 24. In 1954, TOA Corporation developed the EM-202, the world's first transistorized megaphone. 25. A transistorized duel points breaker distributor coupled with a Prestolite ignition and solid core wires was also used. 26. Most powerful transistorized bass amplifiers use class AB or so-called " push-pull " topology. 27. The HITAC 301, released in May 1958, was Hitachi's first fully transistorized computer model. 28. The thirty-one centimeter display is fully transistorized and adopts a mixture of analog and digital circuitry. 29. The X1 was a solid-state binary computer ( " completely transistorized " ) with magnetic core memory. 30. Transistorized drives can directly vary the applied voltage as required by the starting characteristics of the motor and load.