Traditional inverters – NOT gates – are already made with diodes (typically not light-emitting), resistors ... The next step was to build a S-R latch using the NAND gates and inverters ...

so if anyone can shed any light on early-1960s Texas we would be really interested to know. The internal circuit of a single 7400 dual-input NAND gate. 30px MovGP0 (CC BY 2.0 DE). Over the years ...