TTL Hex inverter...
Intelligent Power and Sensing Technologies | onsemiReally ancient 74F series TTL logic (F stands for "Fast", which they are, compared with the original "74 Vanilla" series. Also lots more power.) Modern families (74HC, for example) are faster and use much less power. They are pin-compatible, but not necessarily logic-level compatible.
Looking at the datasheets:
74F04 = 3.7ns
73hc04 = 7ns*
So the is still sometimes a good reason to choose TTL over CMOS.