(under the class definition) Subject matter wherein the resistor is combined with some other nonelectrical device or structure, for example, of a mechanical or chemical type, having an added purpose or independent utility other than to perfect the resistor, and not otherwise classifiable.
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2+, for strain gauge type resistors together with the structure or device broadly wherein the strain is to be
determined.
13+, for resistors with a condition sensing actuator; especially subclass 32 for a resistor actuated by a compass; subclass 33 for a resistor actuated by a float; and subclass 37 for a resistor actuated by vehicle tire inflation pressure.
50, for a resistor mounted on wheels or vehicles.
277, for a resistor with protecting structure spaced from the element or terminal. 315+, for a resistor with mounting or supporting means.
334, for resistors electrically connected to other electrical devices, and not otherwise classifiable.