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Looks like those drums were made during 'tween wars. they would have been lighter to transport back for refilling and handling.Never heard of a drum like that. What would be the point, other than saving a miniscule amount of iron during the war.
This is wild. I've never seen a can like that, not that I'm a 55 gal drum guru or anything.
Found this PDF document at, of all places, Alaska DNR, (Department of Natural Resources)
http://dnr.alaska.gov/parks/oha/publications/Ubiquity Drums_v5 3x4pdf.pdf
What I read there is the corrugated cans were of lighter gauge than the none corrugated ones.
Corrugation/ compression rings (on 18 and lighter gauge drums)
Already doneI think you could remove those extra rings though Piet