I remember RTL (and DTL) very well ;-)
How about RRL (relay relay logic)
Where I work we used to make a product using a fair amount (5) or RRL to
implement all the safety interlocks etc.
There was also a fair amount of MML[*] in another product.
[*] MML Mickey Mouse Logic: The fine art of combining RLC circuits with
logic gates to implement logic circuits.
What about the short-lived era of discrete solid-state component logic
with trigger coupling capacitors, steering diodes, collector clamps for
rise time speed-up, and innumerable other circuit cleverness. The legacy
of this era for complex systems was adoption of the SEM or Standard
Electronic Module approach to design and this was carried into the RTL,
DTL, and even early TTL era. This has nothing to do with "thruth" tables