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equipment suppliers in various engineering colleges, universities, research & testing labs, vocational training centers, government projects & organisations, real estate projects around the world at affordable price. few of our concrete testing lab equipments are vee bee consistometer, slump test apparatus...
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, designed for large halls, employed compressed air to amplify the recorded sound. [ ] a sound film is a motion picture with synchronized sound, or sound technologically coupled to image, as opposed to a silent film . the first known public exhibition of projected sound films took place in paris in...