Ralph

In downhole drilling the electronic units will often see 200 deg. C for
several weeks or the tools may come out of the hole and lay in a  snow bank
in Alaska or Siberia for a a couple of weeks and then return to another hole
for a repeat of the hot downhole opertion again.  It requires some different
techniques, solders, finishes etc. to withstand this harsh operating
envirorment.

Phil Hinton

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