It is, therefore, an object of the present invention to provide an SGB for {TAIL ~ a video tape recorder} , which has a simple structure, thereby requiring a small number of components so as to decrease the cost and simplify the assembly, and which achieves {HEAD ~ high reliability} and performance 
It is , therefore , an object of the present invention to provide an SGB for { TAIL ~ a video tape recorder } , which has a simple structure , thereby requiring a small number of components so as to decrease the cost and simplify the assembly , and which achieves { HEAD ~ high reliability } and performance
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