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MC4 connectors are successors of the MC3 Connectors, which were developed by Multi-Contact in 1996. MC3 is the abbreviation of Multi-Contact and its size 3mm PV connector with 3 mm contact pin.
The slider can also have a two-piece hinge assembly attaching the handle to the slider, with the base of the hinge under spring tension and with protruding pins on the bottom that insert between the zipper teeth. To move the zipper, the handle is pulled outward against spring tension, lifting the pins out from between the teeth as the slider moves.
Functions of the junction box. A small metal or plastic junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel—particularly in domestic or commercial buildings.
The typical shackle is a U-shaped loop of metal (round or square in cross-section) that encompasses what is being secured by the padlock (e.g., chain link or hasp). Generally, most padlock shackles either swing away (typical of older padlocks) or slide out of the padlock body when in the unlocked position.
On the right is the back side of the open door. To the right of the door's center are two linked boxes for the combination mechanisms and to the left is a four-movement time lock . This door has a four-point system for pressing the door into its opening (note the two stanchions left of the door opening) capable of exerting one third of the door ...
Burial vault (enclosure) A burial vault (also known as a burial liner, grave vault, and grave liner) is a container, formerly made of wood or brick but more often today made of metal or concrete, that encloses a coffin to help prevent a grave from sinking. Wooden coffins (or caskets) decompose, and often the weight of earth on top of the coffin ...