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In the absence of orthotolidine, soldiers operating in the field during the 1940s test purified water for adequate chlorination by asking another soldier who did not participate. (1940s)

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By Rick Ray

  • Stock footage ID: 19894885
Video clip length: 00:44FPS: 29.41Aspect ratio: 3:2Editorial use only. Learn more
SD$65720 × 480MOV48.4 MB

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