Abstract: Document filing apparatus comprising two rails adapted for mounting on opposite side edges of a drawer or the like container for converting the drawer to contain documents or files in a suspended filing system and a plurality of tabs which are attachable to the documents or files and which can be slidably mounted on the rails. Each rail comprises a channel shaped portion having two side walls joined by a web, which is adapted to embrace the edge of the drawer to locate the rail on the drawer edge, and a flange projecting outwardly from one of the side walls of the rail to slidably carry an end of each tab. The flange has a horizontal guideway surface for the tab and a rib spaced from the side wall of the rail which locates in a recess formed in the tab to locate the tab on the rail and resist accidental dislodgement of the tab from the rail.

Abstract: A device for performing catalytic endothermic reactions which comprises a vessel having a heat exchanger provided with cooling tubes which extend through an outer tubesheet of the heat exchanger. These tubes are sealed against the outer tubesheet of the heat exchanger, and are connected rigidly to the inner tubesheet. Reaction tubes are provided with catalyst support grids, and the sections of these tubes below the grids are of a length that is at least equal to the diameter of the respective tubes. Downstream of the support grids, the process gas discharge tubes extend centrally through the catalyst-free portions of the reaction tubes and are spaced from the inner walls of the cooling tubes. The spaces between the process gas discharge tubes and the reaction tubes are filled with insulating material. The process gas discharge tubes, which are disposed within the cooling tubes, may extend to or beyond the outer tubesheets of the heat exchanger.