Abstract: An apparatus for dispensing frac balls into a wellhead includes an outer sleeve, an inner sleeve positioned and moveable within an interior of the main body and a ball retention device for retaining a frac ball within an interior of the inner sleeve. A retained frac ball held in the ball retention device is released within the inner sleeve when weight or pressure is applied to the inner sleeve to cause the inner sleeve to slide upwardly within the main sleeve.

Abstract: A system includes an aerial drone having a dispensing mechanism and a remote control for wirelessly controlling movement of the aerial drone and the dispensing mechanism. The dispensing mechanism includes a storage area for storing a frac ball and a device for remotely releasing the frac ball from the drone. The aerial drone is remotely controlled to position the drone over the open well bore and where the frac ball is released into the open well bore.

Abstract: An automatically oriented computer display for a targeting computer used in connection with a shoulder-fired missile launcher. A computer operator member of an air defense team will read a computer display from a handheld targeting computer so as to give directional and distance information of approaching aircraft. An electronic compass rigidly secured to the handheld computer continually updates the directional orientation of the computer display as the computer operator moves. Therefore, the computer operator is able to accurately give directional information to a gunner operating a shoulder-fired missile launcher such that the gunner is ready to assess the hostility of the approaching aircraft as they become visible. An embedded computer is provided to decipher the compass signals so they are readable by the handheld computer. Additionally, a global positioning system receiver is provided to give positional information of the gunner and the computer operator.