Abstract: A fastener for securing files of paper, documents, and the like that consists of a base having two side sheet retainers and two additional center sheet retainers. A keeper therefore has three equally spaced perforations through which the sheet retainers pass and are bent, to be held down in the keeper groove by locks. Two center sheet retainers project through the center perforation and are bent in opposite directions to be locked.

Abstract: A catalyst for denitrogenating and desulfurizing liquified or solvent refined coals and lignite which includes catalytic metal oxides and/or sulfides impregnated within a porous base of principally alumina with large surface area and pore volume and pores of sufficient diameter throughout to accomodate the liquified coal or lignite molecules. The base material includes surface area of 150-500 m.sup.2 /gm, pore volume of 0.4-1.0 ml/gm, average pore diameter of 40-250 .ANG. with no part of the pore less than 40 .ANG.. The catalytic metals impregnated into these base materials include 4-20% MoO.sub.3, 1-8% CoO, 2-16% WO.sub.3 and/or 1-4% NiO.