The RCA Selectron -- US Patent 2,519,172 Address Decode and Selection
George W. Brown, Radio Corporation of America
Applied: 30 August, 1946
Granted: 15 August, 1950
The '172 patent covers the memory tube decoding making use of the "all-of-four" gating structure
for individual memory elements. '172 describes the internal connection topology
of the selection grid electrodes to both implement partial decoding of the selection address,
but also to minimize the number of electrical connections required to penetrate the glass envelope.