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My copy of GPO shows space between number and degree symbol:
250 oF
in paragraph 9.53
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REPLY
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You must have a cheap bootleg copy from Hong Kong! Actually, I just
noticed that the GPO I grabbed is dated 1973! Referring to the
current edition, I found that Uncle Sam now says to use:
50 to 250 oF (space between "250" and "o")
in paragraph 10.6. Who says the government never changes? I think
I'll go burn that 1973 copy now.