| http://www.w3.org/ns/prov#value | - Such walls are called ???curtain walls??? because, like window curtains, they hang from a supporting framework. leadholder Similar to a mechanical pencil, a leadholder is a drawing tool into which an architect can insert lead or plastic pieces of various softness and weight. ???Sometimes you can have a whole book of different types of pencils that you can use for different line weights,??? Hall sa
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