(under subclass 200) Subject matter which includes a movable magnetizable member and a magnetic marking means to form magnetic field marks on the member in the direction of its movement, and wherein the apparatus to sense and indicate the sensing of the magnetic field is responsive to the marks and indicates the sum of the marks as an indication of its length or compares the sensed marks to indicate a deviation of its length between markings.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
732+, for feeding a fabric or cord through a fabric or cord distance measuring device in contact with the fabric or cord.
226, Advancing Material of Indeterminate Length,
10+, for control means actuated in response to marks on advancing material.
242, Winding, Tensioning, or Guiding, 431, for a winding machine under the control of an electrical property of an article being wound, and subclasses 334.3, 334.4, 485.5, 487.5, 534+, and 563+ for a detector or stop which may measure length of an elongated material being wound or unwound.
333, Wave Transmission Lines and Networks,
141+, for electromechanical transducer-type time delays.
360, Dynamic Magnetic Information Storage or Retrieval,
1+, for recording or reproducing from an element of diverse utility, and subclass 6 for recording or playback apparatus combined with metering or sensing.
