Bureau of Standards Washington, D.C. Gentlemen:
I have your letter of last week and am mightily glad you agree with me on the use of hydrochloric acid.
Sincerely, Tom Brown, Plumber
Mr. Tom Brown, Plumber Yourtown, U.S.A. Dear Mr. Brown:
We wish to inform you we have your letter of last week and advise that we cannot assume responsibility for the production of toxic and noxious residues with hydrochloric acid and further suggest you use an alter- nate procedure.
Sincerely, Bureau of Standards
Bureau of Standards Washington, D.C. Gentlemen:
I have your most recent letter and am happy to find you still agree with me.
Sincerely, Tom Brown, Plumber
Mr. Tom Brown, Plumber Yourtown, U.S.A. Dear Mr. Brown:
Don’t use hydrochloric acid, it eats the hell out of pipes!
Sincerely, Bureau of Standards
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