In medicine, nail clubbing (also known as drumstick fingers and watch-glass nails) is a deformity of the fingers and fingernails associated with a number of diseases, mostly of the heart and lungs.
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Note that when in the safe position, the safety lever is forward and up - the same as the second type safety, the New Safety, and the Universal Safety. When this Joint Safety appeared, production C-96s had the first type safety - a short travel arc, on safe when the safety lever was pulled down. So the Joint Safety was an early attempt by Mauser to make a safety which worked somewhat like the later production safeties.