Keyboard musical instrument
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United States of America Patent
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Dec 13, 2016
Grant Date -
Mar 12, 2015
app pub date -
Sep 8, 2014
filing date -
Sep 10, 2013
priority date (Note) -
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Abstract
Provided is a keyboard musical instrument such as an acoustic piano or an electronic piano having an appearance and design similar to an acoustic piano, in which a fall board is made of a resin plate-shaped body, and hollow portions are provided inside the plate-shaped body. In addition, the plate-shaped body includes a plate-shaped resin foamed plate portion, and the hollow portions are made of plural air bubbles contained inside the resin foamed plate portion.
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