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1. Safety reversal: All the garage door opener furnished with safety reversal feature. The door has two sensors situated six inches across the floor level, either side in the door. When any object like pet, child or anything else, speak to light beam created by sensor even though the door is closing, the entranceway stops and reverses. If your opener have not this safety reversal feature, change it out as quickly as possible.
Signs of birth. Since the middle of the 20th century, technology has grown faster and faster. It was only six and a half years since the discovery of uranium fission in January 1939 to the first atomic bomb exploded in July 1945. The emergence of electronic computers has led to more profound changes in the fields of human social life. These technological breakthroughs can be called technological revolutions
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