Abstract: The subject matter describes systems, software, networks, platforms and methods to create one or more applications to assess an aptitude or a preference of a user, to interact dynamically with the user in a setting of a virtual task, to record and evaluate the interactions, to provide a learning platform to let the user acquire skills, and to allow teachers, parents, counselors and guardians to review the status and progress of the user.

Abstract: The subject matter describes systems, software, networks, platforms and methods to create one or more applications to assess an aptitude or a preference of a user, to interact dynamically with the user in a setting of a virtual task, to record and evaluate the interactions, to provide a learning platform to let the user acquire skills, and to allow teachers, parents, counselors and guardians to review the status and progress of the user.

Abstract: A control system for regulating starting and various operations of a walk behind and self-propelled trencher. The control system conditions the trencher for forward, neutral, and reverse operation through use of a single control lever mounted for sliding movement in a common plane extending between a neutral/start position and a drive position and thence in another plane to forward or reverse positions to control the direction of the trencher. When the control lever is in a neutral/start position, a power assembly on the trencher is ineffective to drive wheels used to propel the trencher across a field. When the control lever is shifted to a drive position, a drive path is established between the power assembly and at least one of the wheels on the trencher. The control system is configured to allow the power assembly to be started only when the control lever is in a neutral/start position and prevents starting of the power assembly when the control lever is in other than a neutral/start position.

Abstract: A vertical lift and blade control mechanism for a plow blade which is particularly suitable for a vibratory plow assembly used for laying cable, pipe, and the like underground. The blade control mechanism is generally in the form of a parallelogram frame assembly including substantially equal length vertical frame members which are parallel and interconnected by links to form a four bar linkage arrangement that is collapsible for adjustable movement of the plow blade. The frame assembly is pivotally connected at one corner to a rigid mast assembly, and a first piston cylinder is connected between the mast assembly and frame assembly for raising and lowering the plow blade between a generally vertical plowing position and a transport position. The vertical frame members are shifted relative to each other by a second piston cylinder to provide variable digging depths for the plow blade.