| http://www.w3.org/ns/prov#value | - This passage is: formed in any suitable manner, such as for example, by cutting an opening in the back wall 64 of the vertical duct 47 and punching a similar opening in its front wall 66 with a drawn cylindrical collar or portion 67 extending toward and overlapping a portion of the outwardly directed flange 31 about the access opening 29 in the front wall of the drum.
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