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Class Information
Number: 369/148
Name: Dynamic information storage or retrieval > Specific detail of information handling portion of system > Mechanical modification or sensing of storage medium > Specified structure of electrical transducing assembly > Magnetic field variation (e.g., magnetostrictive) > Variable reluctance
Description: Subject matter wherein the magnetic field variation is caused by a stylus-linked portion of the magnetic field circuit.

Sub-classes under this class:

Class Number Class Name Patents
369/149 Fixed coil surrounding fixed part of magnetic path 22

Patents under this class:

Patent Number Title Of Patent Date Issued
4456984 Magnetic pick-up and/or cutter cartridge Jun. 26, 1984
4357633 Engraving apparatus and method Nov. 2, 1982
4345322 Pickup cartridge for reproducing signals recorded on a 45-45 stereophonic record disk Aug. 17, 1982
4221937 Moving iron type cartridge Sep. 9, 1980
4183059 Track skipper for a video disc player Jan. 8, 1980
4037060 Stereophonic pickup cartridge Jul. 19, 1977
4031335 Stereo pick-up with casing serving as common pole piece Jun. 21, 1977
4004108 Armature for sound pick-up cartridge Jan. 18, 1977

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