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Names come from: no legend on this sheet, so NECA 100-2006 is what a name rests on. It is the baseline for what a symbol MEANS, never for matching shapes — proportions differ per firm. Confirming a name here is a correction, and corrections are what build the firm's file.
Scale is 6"=1' — 36 points per foot. Read off the title block, so measurement off this sheet is available. A later correction flags any measurement taken under the old scale as stale rather than silently recomputing it.