(under subclass 175) Subject matter comprising sound deadening material physically or mechanically attached or installed on the acoustical device, or an element thereof to prevent vibratory noise usual to the operation of the device.
SEE OR SEARCH CLASS
73, Measuring and Testing,
514.12+, for fluid or fluent material dampening of an
inertial member in an acceleration measuring apparatus and subclass 514.14 for vibration dampening in an inertial-type acceleration measuring apparatus.
105, Railway Rolling Stock,
452, for sound deadeners limited thereto.
248, Supports, particularly the subclasses pertaining to resilient or vibration dampening supports for those which dampen sound. 295, Railway Wheels and Axles,
