| http://www.w3.org/ns/prov#value | - Many types of resistance devices, components are known such as pivoting devices, sliding devices, weights on cables or levers, braking motors, generators, brushless generators, eddy current systems, magnetic systems, alternators, tightenable belts, friction rollers, etc. and could be substituted in the devices illustrated while still being within the scope of the present invention.
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