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Code authorities in various jurisdictions revise their codes at different times. You would need to ask this question with respect to the code for the area in which you are interested.

2007-01-13 16:55:54 · answer #1 · answered by Ed 6 · 0 0

I live in Michigan, and my house is 1971 and it has those..but im not sure if they were added at some point

2007-01-13 17:23:59 · answer #2 · answered by gary d 3 · 0 0

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