

Maybe certain kinds of hand tools?
Any kind of rotary tool/machine really. If your ring gets grabbed by any spinning equipment it can pull you into the machine or deglove your finger.
I don’t really wear my ring unless I’m going out somewhere nice with my wife because I work with a lot of heavy machinery.

Isn’t that just in the case of later developing capitalist countries? My understanding was that he believed later developed capitalist countries would be unable to build the industrialized economy that creates a large proletariat class. So in these countries the existing proletariat would have to seize control and then later form an alliance with the peasantry down the road.
However, I don’t think that means he only wanted to develop socialism with western nations. I mean Stalin and him had a major rift develop over Trotsky wanting to support the Chinese communist and Stalin siding with the kmt. One of the things I kinda agree with when it comes to Trotsky was his opposition to the socialism in one country policy.
This is kinda dependent on what year it is of course, Trotsky was kinda all over the place once he fell from grace.