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From Self-sufficiency
- ...oped in the interwar period by [[Stewart Blacker|Lt-Col Blacker]], [[Royal Artillery|RA]]. The spigot mortar was based on early [[infantry]] trench mortars. By *'''Calibre''': 7 in (178 mm)8 KB (1,294 words) - 19:17, 2 July 2010
- ...control_system|fire control]]<ref>Campbell, ''Naval Weapons of WW2'',p113, 178, 226 and 319. Campbell notes that the first USN tachymetric 40mm gun direct [[Category:40 mm artillery]]4 KB (634 words) - 20:12, 2 July 2010
- |caliber={{convert|7|in|mm|sing=on|sigfig=4}}<ref name=Gunnery1887/> <!-- Artillery specifications -->15 KB (2,321 words) - 20:21, 2 July 2010
