how do you know that you're going to be holding a "bomb" just because you don't know what company actually built the cylinder? Do you really think a failed cylider will literally explode randomly? Look up scuba rockets on Youtube: it's quite interesting and nothing like a "bomb". Let's say you do know who made the cylinder, how does that mean it is good/bad, unless there is a documented history of shoddy workmanship/materials?
Just something to ask youself: does it really matter?
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