Talk:646.1 Manholes

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Revision as of 07:51, 9 September 2008 by Merric (talk | contribs) (Type 2 vs. Type 3 Manhole Frame & Cover)
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I was asked, "How do you know when to use a Type 2 vs. a Type 3 Manhole Frame & Cover". The standard drawing shows the weight difference for these but I can not find any other information on these.