(under subclass 92) Subject matter wherein the pressure opposing structure derives its opposing pressure from a liquid or gas.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53, for apparatus in which significance is attributed to conditioning or developing a muscle employed while stair climbing or simulating stair climbing and which uses a fluid resistance.
55+, for apparatus in which significance is attributed to conditioning or developing a muscle employed while swimming or simulating swimming.
73, for apparatus in which significance is attributed to
conditioning or developing a muscle employed while rowing or simulating rowing and which uses a fluid resistance.
133+, for a frame which supports both the user and force resisting apparatus while force exerted by the user is transmitted through the frame and wherein details of the fluid resistance apparatus are not claimed.
139, for a user interface element wherein details of the fluid resistance apparatus are not claimed. SEE OR SEARCH CLASS
441, Buoys, Rafts, and Aquatic Devices, particularly
55+, for a swimming aid to increase stroke efficiency in water.
