Standard Speciﬁcation for Clay Drain Tile and Perforated Clay Drain Tile1
This standard is issued beneath the ﬁxed designation c 4; the quantity straight away following the designation indicates the yr of authentic adoption or, inside the case of revision, the 12 months of last revision. quite a number in parentheses shows the year of closing reapproval. a superscript epsilon (e) shows an editorial trade since the remaining revision or reapproval.
This widespread has been authorized for use via groups of the branch of protection
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