Abstract: A transmitter housing cap removal apparatus and method. The transmitter housing cap removal apparatus can be configured to include a spool portion having a ball bearing mount and spring, and a device housing having a wrench assisting hex nut component and a gripping surface, wherein the device housing engages with the spool portion. The transmitter housing cap removal apparatus further includes a spring mounting plate attached to an interior portion of the device housing, and a spring-loaded multiblock mating surface assembly, wherein the spring mounting plate is located within the device housing to provide a surface for the spring-loaded multiblock mating surface assembly to be mounted thereto. The transmitter housing cap removal apparatus can incorporate a multiblock stopping plate that engages with and prevents movement of the spring-loaded multiblock mating surface to assist in permitting removal of the transmitter housing cap.

Abstract: The base member of a mine roof prop is provided with a closed lower chamber and an adjoining open-top upper chamber in which the lower end of a post is slidably mounted, with means at the upper end of the post for engaging a mine roof. A body of liquid is supported in the lower chamber by flexible means, below which there is an air inlet. The base member also has a liquid passage connecting the upper part of the lower chamber with the lower part of the upper chamber so that when compressed air is delivered to the air inlet, the flexible means will force liquid up through the passage and into the upper chamber to raise the post, whereupon a valve can be closed to trap the liquid in the upper chamber.