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Olympus absolutely did not come up with TTL metering for ambient...cameras like the Topcon RE Super (Beseler Topcon Super D in USA) had TTL back in the early 1960s.
Olympus did develop TTL OTF flash metering with the OM-2 in 1975.
TTL flash metering was developed first by Minolta, and was used in the Minolta CLE, a rangefinder. Minolta then sold the technology to other firms. The Olympus version was the first to have been adopted in a SLR but not the first overall.
EDIT I went and check, and the Minolta CLE seems to have been introduced in 1980. So my memory failed apparently.