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Tudalennau sy'n cysylltu â "Delwedd:Identified! (Vivian Leroy Crisler (1885-1953), an acoustics researcher at the National Bureau of Standards, Washington, D.C., looking over a loud speaker horn used in sound penetration tests) (LOC) (21890090555).jpg"

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Mae'r tudalennau isod yn cysylltu â Delwedd:Identified! (Vivian Leroy Crisler (1885-1953), an acoustics researcher at the National Bureau of Standards, Washington, D.C., looking over a loud speaker horn used in sound penetration tests) (LOC) (21890090555).jpg:

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