Apparently the idea of "jet logic" as a useful substitute for electronics in some situations (hence dubbed "pneumonics"), gained some popularity in Russia back in the '60s. Here is a moment in a fascinating educational video where they explain the workings of a jet NOR/OR gate:

https://youtu.be/gzGRLdB0BpE?list=PLgqu8dCNRlmX_d0Oz3T6gRTyw...