The old Cannon&#x2F;Amphenol connectors are still my favorite, and they supposedly go back to the 30s:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;MIL-DTL-5015" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;MIL-DTL-5015</a>