in which each contact set includes a contact which is not secured to or part of a supporting layer, e.g. a snap dome

Full Title

Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch > having a plurality of operating members associated with different sets of contacts, e.g. keyboard > with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches > in which each contact set includes a contact which is not secured to or part of a supporting layer, e.g. a snap dome