|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G11 |
INFORMATION STORAGE

|  | G11B |
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer Fulltext... Hierarchy... Expanded...G01D; photochemical processing of recordings Fulltext... Hierarchy... Expanded...G03C; recording or playback apparatus capable only of dealing with binary digits Fulltext... Hierarchy... Expanded...G06K; circuits for coupling output of reproducer to radio receiver Fulltext... Hierarchy... Expanded...H04B 1/20; electromechanical transducers and circuits therefor Fulltext... Hierarchy... Expanded...H04R)

|  | G11B |
Note(s) This sub-class deals with the recording and playback of information by relative movement between a record track and a transducer, the transducer directly producing, or being directly actuated by, modulation in the track being recorded or played-back, and the extent of modulation corresponding to the signal being recorded or played-back. This sub-class includes apparatus and machines for recording or playback, and parts thereof, such as heads;(b) record carriers for use with such apparatus and machines; (c) associated working of other apparatus with such apparatus and machines. In this sub-class: The term "head" includes any means for converting sinusoidal or non-sinusoidal electric wave-forms into variations of the physical condition of at least the adjacent surface of the record carrier, or vice versa. A record carrier is understood to be a body, such as a cylinder, disc, card, tape, or wire, capable of permanently holding information, which can be read-off by a sensing element movable relatively to the recorded information.

|  | G11C |
STATIC STORES (recording and playback of information by relative movement between a record track and a transducer Fulltext... Hierarchy... Expanded...G11B; pulse technique in general Fulltext... Hierarchy... Expanded...H03K, e.g. electronic switches Fulltext... Hierarchy... Expanded...H03K 17/00)

|  | G11C |
Note(s) This sub-class deals with devices or arrangements for storage of bits of information: in which no relative movement takes place between an information storage element and a transducer; which incorporate a selecting-device for writing-in or reading-out the bits of information into or from the store. In this sub-class, a storage element is provided with means for writing-in and reading-out at least one item of information. Elements not adapted for storage and not provided with such means are classified in the appropriate sub-class, e.g. of Fulltext... Hierarchy... Expanded...H01, Fulltext... Hierarchy... Expanded...H03K.