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Is 41.5793005833330 monme (匁) as heavy as a Billiard Ball?

It's about as heavy as a Billiard Ball
The weight of a Billiard Ball is about 43.4692687916670 monme (匁).
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 41.5793005833330 monme (匁) and 45.3592370 monme (匁). According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
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