| 摘要 |
Grinder head ( 10 ) includes a grinding bowl ( 12 ) provided with a boss 14 fixed to a bottom wall 16 of the bowl ( 12 ) and projecting into the bowl ( 12 ). The head ( 10 ) also includes a grinder ring ( 18 ) that is locatable over the boss ( 14 ) and freely moveable within the bowl ( 12 ). Lid ( 30 ) closes the bowl to prevent the escape of a mineral sample during grinding.
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