In article , Dave Fawthrop
wrote:
They *don't*, only *English* ones have left hand threads for Flammable
gasses, which indicates the contents.

The same convention ("left-hand for hydrogen") is used by at
least two Russian mudlogging companies operating in two parts of Siberia
separated by the guts of 700km, and by a Romanian mudlogging company
off-shore Tanzania.

--
Aidan
Aberdeen, Scotland
Written at Wed, 06 Dec 2006 00:47 GMT, but posted later.