Class Information
Number: 338/112
Name: Electrical resistors > Mechanically variable (e.g., rheostat) > Surfaces pressed together (e.g., compressible type) > Pile type > Contact surface area of piles variable
Description: Subject matter wherein normally only a portion of the facing surfaces of the pile discs are in actual physical contact, the discs being flexible or resilient, the means for varying the engagement pressure and when actuated increasing and/or decreasing the portion of the facing surfaces in actual physical contact.
Patents under this class:
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