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Steel Tuning Fork Pair with Wood Bases, 440Hz (One Adjustable) Grade_Food Grade Hand cranked 4 stroke gasoline engine model Hand cranked 4 stroke gasoline engine model at 13 and three low friction nylon wheels for straight line momentum experiments Adjustable mass on one fork shifts its 440Hz pitch by a few hertz producing audible beats when sounded against its fixed frequency partner on the matching wooden resonance base
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