The 4000 series of CMOS logic functions was introduced in 1968. I used it extensively for designs in the late 70's. CMOS definitely wasn't ubiquitous as it is

The 4000 series of CMOS logic functions was introduced in 1968. I used it extensively for designs in the late 70's. CMOS definitely wasn't ubiquitous as it is now, but it wasn't that rare, either.