On Mon, 30 Sep 2013 21:57:57 +0000, Alex Gunderson wrote:

Is there an actual DATE STAMP on the things?
(Note: When I get home, I'll check.)

Yup. On the two regulators (red and gray) at the tank itself,
there is a date stamp on each regulator.

There is no date stamp on the two regulators (brown and gray)
that are at the generator and house accordingly.