Dynamic Detonators -- This is a safety impact apparatus used to determine the ability of a gap to withstand a sudden heavy blow. A ten-pound weight is allowed to fall on a dap lying on its side. Mason, E. Gill, research technician, places a steel block on a newly developed detonator prior to testing it. August 29, 1946. (Photo by Wide World Photos).
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TOP27909686
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達志影像
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RM
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