How Trombones Are Made
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Added: 3 years ago
From: pickletoon
Views: 10,215
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  • Very informative!

    PatentClerk 3 weeks ago

  • Very instructive & entertaining - I've often wondered how they were made - Now I know !

    The use of the steel balls to make the internal dimensions of the bends correct is very ingenious.

    Thank you for uploading, nice one ! :-))

    23565120 2 months ago

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