Abstract: A bidirectional drilling downhole steering and survey tool for detecting ferromagnetic bodies from an off vertical borehole, transmitting the signals from the downhole sensors to surface equipment while drilling, and for calculation of the range and direction to the detected ferromagnetic body for the use of the directional driller in intercepting or avoiding the ferromagnetic body. In combination with the steering and range and direction to ferromagnetic body capabilities, the downhole tool may also include sensors for detecting formation bed interface, apparatus for electric or gamma ray or radioactive logging, neutron density sensor apparatus and other formation evaluation or correlation apparatus. The downhole tools may be packaged, in either an electric line transmitted tool of MWD transmitted tool.

Abstract: A directional drilling downhole steering and survey tool for detecting ferromagnetic bodies from an off vertical borehole, transmitting the signals from the downhole sensors to surface equipment while drilling, and for calculation of the range and direction to the detected ferromagnetic body for the use of the directional driller in intercepting or avoiding the ferromagnetic body. In combination with the steering and range and direction to ferromagnetic body capabilities, the downhole tool may also include sensors for detecting formation bed interface, apparatus for electric or gamma ray or radioactive logging, neutron density sensor apparatus and other formation evaluation or correlation apparatus. The downhole tools may be packaged in either an electric line transmitted tool of MWD transmitted tool.

Abstract: A method and system for tracking a borehole by means of a probe and an externally produced magnetic field. The magnetic field is produced by a current configuration which facilitates the calculation of the magnitude and direction of the magnetic field at any point in space. In order to locate the probe, magnetometers within the probe are used to measure the magnetic field. Accelerometers within the probe allow the determination of the probe's orientation which enables the measured field vector to be compared to the calculated field vector and the probe's location thereby ascertained.

Abstract: A method and apparatus for performing a surveying operation to locate a target subterranean ferromagnetic body having remanent or impressed magnetization. The surveying operation is conducted from an off-vertical borehole adjacent the target magnetic body using magnetic field sensing apparatus, and involves determining the range and direction of the subterranean target with respect to the location of the magnetic field sensing apparatus. Target direction is determined by measuring three magnetic field components and resolving the measured components into a resultant vector. Target range is determined by measuring total magnetic field intensity and target body magnetic field intensity gradient in the direction of the off-vertical borehole. Both static and time-varying fields may be detected by the subsurface apparatus.

Abstract: An improved dispensing drawer is provided for article dispensing machines, especially those of the so-called "helix vendor" type, which is slideably removable from the front of the dispensing machine and includes at least one article receiving cartridge removably secured within the drawer for efficient loading, storage and release of articles to be dispensed therefrom. The cartridge is removable and replaceable after being loaded with articles from the front of the machine and does not require removal of the drawer for access thereto. An opening in the rear end of the cartridge permits rapid carton-like loading of articles therein when removed from the drawer for replenishment of the dispensing machine by a serviceman.