[Bell Historians] This week's obscure question

[Carl S Zimmerman]

Second obscure question (in two parts): When was the abbreviation 
"RSJ" first used to mean ...[what?]?

(From the contexts in which I've seen this abbreviation used, my best 
guess is "rolled steel joist", but I wouldn't bet money on that. The 
term isn't used in America as far as I know.)

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At 14:36 +0100 2003/10/17, David Bryant wrote:
>When did RSJs first start to be produced? Anyone know?