Flat wide solid ribs are what are called "pigeon ribs". I have not seen a Parker flat rib that was not wide, but they may exist. Flat solid ribs were probably requested. However, I have not seen a request on an order book entry for a tapered rib. Tapered ribs are not rare, but are very elegant. I have no idea how the matting machine was used to process a tapered rib. I will take a close look at one and comment, or someone else may examine theirs and comment.
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