Abstract: An infant stroller that can propel itself under its own power, or in other circumstances provide propulsion assistance to aid the stroller attendant so as to reduce the required effort to push a stroller over various types of terrain. The stroller having a base frame formed of a plurality of connected substantially rigid formed tubular or molded plastic members, the frame adapted to fold for storage. Provided on the frame and interfacing with the ground are a plurality of wheels of which at least one wheel is an electrically driven wheel. The stroller includes two handle arms secured to the rear portion of the frame with a handle grip bar secured to an upper portion of the arms. The handle grip has a battery compartment for receiving a rechargeable battery pack therein. The stroller includes an electrically powered drive means for providing power assist to drive one or more driven wheels over sometimes hilly, grassy or rough terrain.

Abstract: A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

Abstract: An infant stroller that can propel itself under its own power, or in other circumstances provide propulsion assistance to aid the stroller attendant so as to reduce the required effort to push a stroller over various types of terrain. The stroller having a base frame formed of a plurality of connected substantially rigid formed tubular or molded plastic members, the frame adapted to fold for storage. Provided on the frame and interfacing with the ground are a plurality of wheels of which at least one wheel is an electrically driven wheel. The stroller includes two handle arms secured to the rear portion of the frame with a handle grip bar secured to an upper portion of the arms. The handle grip has a battery compartment for receiving a rechargeable battery pack therein. The stroller includes an electrically powered drive means for providing power assist to drive one or more driven wheels over sometimes hilly, grassy or rough terrain.

Abstract: A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

Abstract: A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

Abstract: A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

Abstract: An apparatus which facilitates placing an instrumented probe into a media, including a plurality of probe casings having first and second ends, the first end of one probe casing being configured to selectively couple with the second end of another probe casing at a casing joint to form an insertion tube, the insertion tube having an instrument receiving end, a surface end, and an insertion tube wall which together define a central cavity, and wherein the casing joint includes a seal which functions as a substantial barrier to contaminants.

Abstract: An apparatus which facilitates placing an instrumented probe into a media, including a plurality of probe casings having first and second ends, the first end of one probe casing being configured to selectively couple with the second end of another probe casing at a casing joint to form an insertion tube, the insertion tube having an instrument receiving end, a surface end, and an insertion tube wall which together define a central cavity, and wherein the casing joint includes a seal which functions as a substantial barrier to contaminants.