(under subclass 71.1) Subject matter wherein the noise cancellation system is associated with a structure in a manner designed to cancel noise in the immediate vicinity of a person's ears.
(1) Note. Structures included in this subclass are headrests, hearing protectors, etc. Hearing protectors based on active noise cancellation are classified herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72, for hearing protector without noise cancellation.
