Everyone will be covered!

We announced a competition of folk inventions in No. 1 of “Interlocutor” for this year. One of the examples of useful homemade products from the Soviet era was also presented there, and omniscient readers were invited to guess what it was. Few answered correctly (A. Grachev from Lyubertsy, Oksana Stamm from Tula and Nadezhda Panarina). Of course! You had to live in an era of total shortages and do canning to realize: this is a machine for straightening used tin lids. The lid was carefully removed from the jar, the edge was rolled, and the closure could be reused!
Attention, now a new task - guess what’s in the photo. Hint: this device is somehow connected with bloodshed...