04912471 is referenced by 140 patents and cites 22 patents.

An interrogator-responder communication system in which responders are carried by vehicles (such as railroad vehicles) travelling along a route and in which an interrogating station situated along the route operates each passing responder to recall data from a memory in the passing responder. In one embodiment, the responder is equipped to receive data transmitted from a transmit station and to store the received data, for later recall, in a non-volatile, electrically erasable read/write memory.

Title
Interrogator-responder communication system
Application Number
6/548316
Publication Number
4912471
Application Date
November 3, 1983
Publication Date
March 27, 1990
Inventor
Robert W Shillady
North Wales
PA, US
Robert M Tyburski
Fairfax
VA, US
Agent
Jim Zegeer
Assignee
Mitron Systems Corporation
MD, US
IPC
G01S 13/86
G01S 13/80
G01S 13/76
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