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grade of reinforcing steel in the 20's

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Does anyone know what the grade of reinforcing steel was in the 1920's.

thanks in advance.

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Sincerely,
Mr. Marlou B. Rodriguez
Engineer

Robert Englekirk Inc. (REI)
Englekirk and Sabol  (ESI)
1130 North Nimitz Hwy #A215
Honolulu, HI 96817-4579

Note:  The comments that I write, 
are my own opinions and are not
necessarily the opinions of REI or ESI
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