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Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
Scientific techniques exist to track the specific kinds of rock or minerals that were used to make stone tools in various regions back to their original sources. As well as stone, projectile points were also made of worked wood , bone , antler , horn , or ivory ; all of these are less common in the Americas.
One of its peacetime products was machinery for making autocannon and artillery shells. It made autocannon rounds. TZ Texas Foundries Inc. (1976–2009) – Lufkin, Texas. W, WC, or WCC Western Cartridge Company – East Alton, Illinois Manufactured .30-'06 Springfield ammunition during World War I and World War II.
Archeologists in Louisiana have discovered that early Native Americans used Alligator gar scales as arrow heads. "Hunting with a bow and arrow requires intricate multi-staged planning, material collection and tool preparation and implies a range of innovative social and communication skills." [6]
It may be the entity who first designed the part (that is, the ODA), but today it is also likely to be a designated successor entity, owing to mergers and acquisitions (M&A) activity (e.g., ODA company was bought by CDA company); contract letting (e.g., an Army engineering department ODA turns over the design activity to the prime contractor ...
British Morris and MG engines from 1923 to 1955 were built using metric threads with bolt heads and nuts dimensioned for Whitworth spanners and sockets. [13] In 1919, Morris Motors took over the French Hotchkiss engine works which had moved to Coventry during the First World War.
The tool is simple, small and light. The contact surfaces of the screw or bolt are protected from external damage. There are six contact surfaces between bolt and driver. Very small bolt heads can be accommodated. The tool allows the use of headless and recessed-head screws. The screw can be held by the key while it is inserted into its hole.
Many measurement devices outside this section may be used or at least become part of an identification process. For identification and content concerning chemical substances, see also Analytical chemistry, List of chemical analysis methods, and List of materials analysis methods.
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