You asked: "Where would I locate the exemption or special permit number?" On the cylinder, instead of finding the "3AL" inscription, you'll find "SP-" with the permit number. For instance, I have two cylinders with "SP-6498" inscription on them. On these cylinders it is not written "3AL". Michel Therrien -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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