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2. Bored cylindrical lock - Wikipedia

   en.wikipedia.org/wiki/Bored_cylindrical_lock

   The modern bored cylindrical lock was invented by the German-born engineer Walter Schlage [4] in 1923 [5], as an innovation on a patent filed in 1920 [6] for a lock whose installation required a face bore and surface rabbet, simplifying door preparation compared to a traditional mortise lock.

3. Mach number - Wikipedia

   en.wikipedia.org/wiki/Mach_number

   The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.

4. QF 3.7-inch mountain howitzer - Wikipedia

   en.wikipedia.org/wiki/QF_3.7-inch_mountain_howitzer

   Indian gun crew firing, India, circa. 1930. The 3.7-inch howitzer superseded the 2.75-inch mountain gun following the First World War.It was used by mountain artillery regiments of the Royal Artillery and the Indian Artillery, and saw much service on the North West Frontier of India between the wars.