I'm sorry guys but this thread can be closed. I know this for sure, the Finnish Navy used these machines still when I was doing my conscription service.
This is a colon cleansing apparatus for field use, designed for the navy to be used in often very small and cramped space of a battle ship. Finnish navy has never been famous because of the food served to sailors; cooks on board are normal young men doing their conscription, with no experience in cooking. As has always been typical to Finnish navy, officers deciding where you serve used creative formulas to help them decide. A cook in civilian life makes his conscription as a ship's mechanic, a machinist serves as navigator, a merchant navy first officer as cook.
Because of this, colon cleansing has to be done regularly to all sailors. With this machine it is possible to clean colons of six sailors at once. Notice the centrally located CPU; six sailors can stand very close each other during the cleansing procedure making this ideal machine for small spaces.
That's all, folks!