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2. Washer (hardware) - Wikipedia

   en.wikipedia.org/wiki/Washer_(hardware)

   An archaic form of this washer was sold as a "pot mender", usually in small quantities through a retail ironmonger. This included two washers, a nut, and bolt, and a sealing washer of rubber, cork, or fibre sheet. They could be used for sealing small holes, rust spots or removed pipe connections in water tanks or large cooking vessels.

3. Pressure cooker - Wikipedia

   en.wikipedia.org/wiki/Pressure_cooker

   One such method is a hole in the lid that is blocked by a low melting point alloy plug and another is a rubber grommet with a metal insert at the center. At a sufficiently high pressure, the grommet will distort and the insert will blow out of its mounting hole to release pressure.

4. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   It indicates the diameter of smooth-walled hole that a male thread (e.g. on a bolt) will pass through easily to connect to an internally threaded component (e.g. a nut) on the other side. For example, an M6 screw has a nominal outer diameter of 6 millimetres and will therefore be a well-located, co-axial fit in a hole drilled to 6 mm diameter.

5. Tympanostomy tube - Wikipedia

   en.wikipedia.org/wiki/Tympanostomy_tube

   The eardrum usually closes without a residual hole at the tube site but in a small number of cases a perforation can persist. [1] For children with otitis media with effusion (glue ear), tympanostomy tubes decrease the prevalence of effusions by 33% and improve hearing by 5-12 decibels, within 1–3 months of the procedure. There is no long ...

6. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   18.44 meters – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches) [126] 20 meters – length of cricket pitch (22 yards) [127] 27.43 meters – distance between bases on a baseball field (90 feet) 28 meters – length of a standard FIBA basketball court

7. 1.1-inch/75-caliber gun - Wikipedia

   en.wikipedia.org/wiki/1.1-inch/75-caliber_gun

   The 1.1"/75 caliber gun was an American anti-aircraft weapon of World War II, used by the United States Navy. [3] The name means that it had a bore diameter of 1.1 in (28 mm) and barrel caliber of 75 (1.1 inches × 75 = 82.5 in (2.1 m)). The gun was designed to replace the M2 Browning and four barrels were required to duplicate the rate of fire.