I am looking for technical data on a 16 pin logic chip produced by Texas Instruments in the early 1970's. The IC markings are: MIC 7/C and 7424 (line over last 4). The chip was used in a Smith's (U.K.) seat belt interlock unit. The seat belt unit was required to meet 1974 Federal Motor Vehicle requirements to inhibit a car from starting unless the drivers seat belt was fastened.
I looks through my old books and obsolete parts and found no match.
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