Assertion: trombone's bore | /r/SimilarTo | that of a small tenor trombone
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Source sentences:
text: The bore of an alto trombone is similar to that of a small tenor trombone – usually around 0.450 to 0.500 inches (11.4 to 12.7 mm) with a 6 1⁄ 2 or 7 inches (17 or 18 cm) bell.