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2. RML 2.5-inch mountain gun - Wikipedia

   en.wikipedia.org/wiki/RML_2.5-inch_Mountain_Gun

   Writers who refer to "7-pounders" in World War I are in fact referring to this 2.5-inch (64 mm) gun. Romania bought 36 of these guns in 1883–1884, being designated in the local military nomenclature as "63 mm Armstrong mountain guns model 1883". They were the first guns designed for mountain warfare in Romanian use.

3. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   The spanner [81] or Snake-Eyes (trademarked) [82] screw drive uses two round holes (sometimes two slots; the same driver bits work in both types) opposite each other and is designed to prevent tampering. Other informal names include pig nose, drilled head or twin hole. [83]

5. List of GM bellhousing patterns - Wikipedia

   en.wikipedia.org/wiki/List_of_GM_bellhousing...

   Also called the GM small corporate pattern and the S10 pattern. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the right side of the block (when viewed from the flywheel) and on the opposite side of the block compared to front wheel drive installations.

6. Punched tape - Wikipedia

   en.wikipedia.org/wiki/Punched_tape

   Tape for punching was usually 0.00394 inches (0.100 mm) thick. The two most common widths were 11 ⁄ 16 inch (17 mm) for five bit codes, and 1 inch (25 mm) for tapes with six or more bits. Hole spacing was 0.1 inches (2.5 mm) in both directions. Data holes were 0.072 inches (1.8 mm) in diameter; sprocket feed holes were 0.046 inches (1.2 mm). [8]

7. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   This feature causes the tap to continuously break the chip and eject it forward into the hole, preventing crowding. Spiral point taps are usually used in holes that go all the way through the material, so that the chips can escape. Another version of the spiral point plug tap is the spiral flute tap, whose flutes resemble those of a twist drill ...