| http://www.w3.org/ns/prov#value | - Preferably the hinge support is acted on by a spring which tends to separate it from the base, the closing of the switch' to complete the circuit through the contacts and to im part an initial vibration to the vibratog. member being effected by su rt towards the base. e invention is particularly applicable to apparatus for delivering a series of electric current impulses to a dental or surgical ch
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