The 74LS04: Hex inverter gate; 
<p>Member of the low power Schottky TTL (the 74LS series)
</p>
Made by I.P.R.S. Baneasa, Romania. 1980s
<a href="//commons.wikimedia.org/wiki/User:Mister_rf" title="User:Mister rf">Mister rf</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>