DS DS/EN 23964
DS DSEN 23964 1991-MAR-20 Dental handpeces - Couplng dmensons
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The standard specifies the nominal dimensions and tolerances of the swivel-type coupling used between the dental handpieces and their driving mechanisms. It is not applicable to the older "slip-joint" coupling. It is restricted to mechanically coupled handpieces of the slow or medium speed types.