more help with identification

pictured below are more items that i got at a local auction. any help identifying would be much appreciated as well as advice on resale. i have 6 of the ones in the first picture, 3 different sizes. most of them are bolted together on the ends, two are welded. not sure how well the images show the bolts. no manufacturers marks. i have 2 of the keys (?) and around 20 of the other items. thanks in advance for any help or advice.

image: frames1.jpg


image: frames2.jpg


image: key.jpg


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They look like chases for rubber stamp vulcanizers and Wickersham quoins and a key.