| http://www.w3.org/ns/prov#value | - The containers should be made from light and strong material such as aluminum, magnesium, or some of the novel compressed paper compounds, in order to reduce the weight thereof as much as possible, but evenso it is found that the packed containers, when placed on top of each other, are subject to considerable pressure, and it may for this reason be found advisable to corrugate the sides and ends o
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