Abstract: An archival mounting corner having a pocket for releasably securing a primary sheet relative to a secondary sheet. The pocket opening is defined by substantially parallel walls wherein one wall includes a non-parallel region. The mounting corner includes a base member defining one wall and a pocket member defining the remaining wall, wherein the base member includes a recess at least partially occluded by a pocket member. The mounting corner is formed of an inert material having an adhesive pad circumscribed by the periphery of the mounting corner.

Abstract: A perforator has an inner drum positioned within an outer drum. The drums define a nip through which a web of photographic film or other material is fed for forming perforations in the web by punches and dies on the drums. The dies are formed in a strip carried by the outer drum, and the punches are on disks on the inner drum. The die strip and disks are easily replaced when the dies and punches become worn.