Abstract: A keyboard supporting mechanism employs a parallelogram linkage secured to a mounting member by a single pivot connection for supporting the whole of the linkage and a keyboard support for vertical swinging movement relative to a base, and a locking mechanism for retaining the keyboard support in a desired vertical position, which includes cooperating locking surfaces carried by the linkage and mounting member.

Abstract: A cartridge filter is adapted for mounting on a tube sheet in a baghouse filter system and can be configured for removal from either the top or the bottom of the tube sheet. The cartridge filter includes a filter tube with proximate and distal ends and a filter tube passage extending therebetween. The filter tube includes a media element and mounts a tube mounting assembly on its proximate end and a cap on its distal end. The tube mounting assembly includes a boot for attachment to either the tube sheet in a top removal configuration or to a bagcup mounted on the tube sheet in a bottom removal configuration. The tube mounting assembly also includes a connector which is molded onto the boot and which pots the filter tube proximate end.