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Supportive structural beams in the back of upright pianos. There are typically 3-6 back posts on an upright piano. Part of the manufacturing process is to design a backpost structure that provides optimum support and tonal resonance, and each manufacturer tends to have different ideas of what an ideal backpost structure should be.

Schimmel K

Yamaha YUS

Mason & Hamlin Model 50

Boston UP

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