The TGS-1 shock generator, designed and made by IBD PAN (Polish Academy of Sciences Institute of Experimental Biology), is a 1970s device used in operant conditioning experiments with animals in Skinner boxes. When triggered, it delivered an electric shock to the creature, with adjustable current and duration.
This Polish made shock generator comes from my local medical university, and I got three of them - one disassembled, one restored and one stashed away. It is built as a 3U 19" rack mounted device, suggesting it was a part of a larger experimental setup. It interfaces with a control device via a BNC socket, has a pair of binding posts on the back panel and a 20-pin Tuchel type output connector there. It also has six banana jacks on the front panel, connected to two change-over contacts of a relay. I still don't know what they were used for. Possibly for informing the test subject, or marking the shock event on a cumulative record.