A foot control installation, which is particularly applicable to dental apparatus, which includes a housing having a projecting actuating member with a foot contact which is horizontally displaceable from an initial position into an operative position in opposition to return biasing means so as to actuate...http://www.google.fr/patents/US3980849?utm_source=gb-gplus-shareBrevet US3980849 - Foot controller switch assembly for dental appliances
Foot controller switch assembly for dental appliances
