(under subclass 1) Subject matter where the digital pattern on the carrier is a spatial variation of a magnetic, or electrostatic field, or permeability thereof to such a field, and the pattern reading device includes a device responsive to such a field.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149, for a digital to analog converter using magnetic components.
150, for a digital to analog converter using capacitors.
171, for an analog to digital converter using magnetic components.
172, for an analog to digital converter using capacitors.
SEE OR SEARCH CLASS
235, Registers, 499+, for magnetic coded record sensors.
324, Electricity: Measuring and Testing,
60+, for measurement of capacitance.
360, Dynamic Magnetic Information Storage or Retrieval,
39+, for magnetic recording or reproduction of a digital signal.
361, Electricity: Electrical Systems and Devices,
271+, for electrostatic capacitor structure.
369, Dynamic Information Storage or Retrieval,
59, for capacitive recording or reproduction of a digital signal.
