US PATENT SUBCLASS 369 / 143
.~.~.~ Electron tube

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

99  DF  SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4}
127  DF  .~ Mechanical modification or sensing of storage medium {6}
135  DF  .~.~ Specified structure of electrical transducing assembly {11}
143.~.~.~ Electron tube

DEFINITION

Classification: 369/143

Electron tube:

(under subclass 135) Subject matter wherein the stylus is coupled to an element which affects operation of an electron tube.

(1) Note. The operation of the electron tube may be affected by either external (e.g., magnet) or internal (e.g., grid) elements.