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LSJ 225 & 242 joists 1954

LSJ 225 & 242 joists 1954

LSJ 225 & 242 joists 1954

(OP)
I have a plan for a building constructed in 1954 that shows LSJ 225 & LSJ 242 joists.  I am unable to find them listed in the SJI 60-Year Manual.  Is any one familair with this type o f joists?  

RE: LSJ 225 & 242 joists 1954

(OP)
The SJI sent me some information today.  The joist appear to have been made by Bethlehem Pratt Co.

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