Abstract: An acoustic microphone assembly for surveillance into a protected space includes a microphone including a transducer and a diagram adapted for picking up acoustic sound waves, electronic circuitry for processing input, a power source, and an audio output wire or trace for delivering processed digital sound to a sound system, a cover plate having at least two bolt openings for mounting to a base plate on a wall or structure the cover plate covering an opening there through into the protected space, the cover plate accepting an orthogonal mounting of the microphone, and a sound diffraction pattern of different sized openings placed through the cover plate, the sound diffraction pattern located in alignment to the mounted microphone head and having a foot print roughly equal to the circumference of the head of the microphone.

Abstract: An acoustic microphone assembly for surveillance into a protected space includes a microphone including a transducer and a diagram adapted for picking up acoustic sound waves, electronic circuitry for processing input, a power source, and an audio output wire or trace for delivering processed digital sound to a sound system, a cover plate having at least two bolt openings for mounting to a base plate on a wall or structure the cover plate covering an opening there through into the protected space, the cover plate accepting an orthogonal mounting of the microphone, and a sound diffraction pattern of different sized openings placed through the cover plate, the sound diffraction pattern located in alignment to the mounted microphone head and having a foot print roughly equal to the circumference of the head of the microphone.

Abstract: Apparatus for transplant propagation comprising a unitary lower tray-forming member and a separate unitary upper tray-forming member carried on lower tray-forming member and cooperatively forming a regular array of transplant plug cells for containing a transplant medium for growing of seedlings. In one embodiment, the upper tray-forming member is removable from the lower tray-forming member and carriers transplant plugs out of the array of cells. In another embodiment, the upper tray-forming member is removable from the lower tray-forming member and leaves the transplant plugs in place on the lower tray-forming member to be carried thereby.