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2. Head saw - Wikipedia

   en.wikipedia.org/wiki/Head_saw

   The original powered head saw was composed of long, narrow blades that used an up-and-down motion, a reciprocating saw. Each blade was set at a fixed width meaning each log was cut identically, regardless of flaws. This design was not energy efficient and around 1860 sawmills began to adopt the more efficient circular saw. In the 1870s, the ...

3. Reciprocating saw - Wikipedia

   en.wikipedia.org/wiki/Reciprocating_saw

   The original trade name, Sawzall, is often used in the United States, where Milwaukee Electric Tool first produced a tool of this type in 1951. [ 1 ] [ 2 ] The noun "Sawzall" is commonly applied to a smaller type of chargeable or battery-powered handheld saw used in construction and demolition work, as well as in gardening and the pruning of ...

4. List of the United States Army weapons by supply catalog ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.

5. Table saw - Wikipedia

   en.wikipedia.org/wiki/Table_saw

   American cabinet saws are normally designed to accept a 13 ⁄ 16-inch-wide (21 mm) stacked dado blade in addition to a standard saw blade. The most common size of blade is 10 inches (250 mm) in diameter with a blade arbor diameter of 5 ⁄ 8 inch (16 mm), but 12 or 14 inches (300 or 360 mm) in diameter with a blade arbor diameter of 1 inch (25 ...

6. Disc cutter - Wikipedia

   en.wikipedia.org/wiki/Disc_cutter

   The most common size for these cutting wheels is 4 + 1 ⁄ 2 inches in diameter; however they can range from 2 to 16 inches in diameter with a thickness range from .045 in. to .125 in. Type 1 discs are flat, and type 27 discs have a raised hub. These wheels are strong but are not immune to breaking.

7. 16-inch/50-caliber Mark 7 gun - Wikipedia

   en.wikipedia.org/wiki/16-inch/50-caliber_Mark_7_gun

   The lightweight 16-in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long, 50 times their 16-inch (406 mm) bore diameter with barrels 66.7 ft (20.3 m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108 t) without the breech, and 267,900 lb (121.5 t) with the breech. [1]