The earlier locks shatter like glass, even case hardened.
The modern ones need a thermal roller coaster. ... they fail eventually.
Had to melt an Ingersoll off a gate years ago, the farmer was trying to be a smartass. It vanished in a cloud of sparks.
The ends of the chain where melted as well. Would love to have seen his face. :)
How long ago is “earlier,” and is this common knowledge?