Abstract: A closure for a door of a structure, for example, a wildlife observation or hunting blind, is provided. The closure can include a base plate, a door latch, a handle, and at least one tracking bar spaced from the base plate to form a gap, sized to receive part of a door panel. The tracking bar can include a primary sliding surface that faces and slides relative to a first side of the panel when converting the closure from a locked mode to an open mode. The plate can include a guide bar slidable within a panel guide slot coextensive with a transverse opening sized so the tracking bar can fit through it and retain the base plate and handle in sliding relation proximate the panel. The door closure can be installed relative to the door manually, without the use of tools. A related method of use is provided.

Abstract: A computer audio interface unit (110) comprises a serial computer interface (e.g. USB) (204) providing a connector (112) for connection to an external, computer-based source (100) of digital audio data samples. A digital audio output connector (130) provides a digital audio output signal to external audio reproduction apparatus (106, 108). A word clock output connector (134) provides a word clock signal to external audio reproduction apparatus, in parallel with said digital audio output signal. An encoder (202/308) receives digital audio data via said USB interface and outputs said digital audio output signal. Clocking circuitry (202/300, 312) is responsive to a timing reference signal (200) independent of said external source (100), and generates said word clock signal for output to the external reproduction apparatus.

Abstract: An improved slopeboard having a solid member with an inner pivotal mounting integrally formed as an aperture within the solid member near the first end of the solid member and with an outer pivotal mounting integrally formed as an aperture within the solid member near the second end of the solid member. In the case of a slopeboard having a moldboard and a framework having an outer pivotal mounting and an inner pivotal mounting, the solid member is attached to such framework. In the case of a slopeboard having a moldboard having an outer pivotal mounting and an inner pivotal mounting, the solid member is attached directly to the moldboard.

Abstract: A slopeboard mounting linkage that raises a slopeboard while also raising and moving a fluid-powered cylinder toward the longitudinal center of the bulldozer to which the cylinder and slopeboard are attached. One end of a rod extending from the cylinder is rotatably attached to the slopeboard as is also one end of a link arm. The other ends of the cylinder and of the link arm are rotatably attached to an angled link that is rotatably attached to the back of the primary push blade of the bulldozer. And the inside edge of the slopeboard is rotatably attached to a long arm of the bulldozer.