No problem  although they  might want to "hydro" the tanks
depending on the dates .

One more item you need to check into before you purchase. Talk to your
insurance agent and update your homeowners policy. This is one item
that may or may not be relevent, but some people forget to do this and
regret it later.....

Hmmm!

I have oxy/acetylene, argon, CO2, and Tri Mix (for stainless mig) in my shop
and I just take them into the gas dealer and they exchange them for me.

The only bottle I don't own is the TriMix and that belongs to the dealer and
no other dealer will fill it. I also pay monthly rental on this TriMix.

However I own all the rest, no longer have to prove ownership. I just go to
any gas dealer and they exchange bottle for bottle without regard to the
inspection dates.

I think the idea is, they get the exchange bottles cycled through inspection
and don't have to worry about refilling bottles that are out of date (the
refill process determine if they are due).

Many years ago (early '80), if you owned your bottles, you had to show proof
and if you didn't own any bottles, they had you make a deposit on "their
bottle" and charge a monthly rent.

Now they don't seem to question owner bottle exchange. And if you don't have
the the bottle, they rent theirs to you along with a deposit and the refill.

Something that you should be aware of, is the present day cost of Acetylene.
I stopped using it about 8 years ago due to the cost and now use tig or mig
for welding and plasma for burning. I still keep a small bottle around for
silver soldering and make sure the valve is tightly closed. I estimate a
simple gas welding or burning job can now use about a bucks worth of gas.. I
have never liked propane for welding or burning. MAP gas seems to be common
in industry but I don't have much experience with it.

A couple other concerns.

An O/A rig has various seals, etc. that deteriorate with age.  In general,
they're inexpensive and doing a little re-building is no big deal...  So
long as you can get the parts...

There are some top-of-the-line manufacturers (Victor comes to mind) that are
widely distributed and for which parts are easily available.  Then there are
some off-the-wall ones where it becomes a real problem.

Jerry