361. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
362. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
363. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
364. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
365. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
366. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
367. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
368. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
369. 305 MM RR mount, assembling side frames Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
370. 305 MM RR mount, fitting diaphrams to side frames Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
371. 37 M/M AA elevated 45 degrees Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 21, 1937 Institution: National Archives at Boston
372. 37 M/M AA elevated 90 degrees Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 21, 1937 Institution: National Archives at Boston
373. 37 M/M AA in traveling position Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 21, 1937 Institution: National Archives at Boston
374. 37 M/M in firing position Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 21, 1937 Institution: National Archives at Boston
375. 4 Brown hoist boom failure Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: September 12, 1920 Institution: National Archives at Boston
376. 500 lb vacuum furnace Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1959–1962] Institution: National Archives at Boston
377. 5th Advanced Training Course Group Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: January 1942 Institution: National Archives at Boston
378. 60' Boom from 4 brown hoist crane failure 912-20 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [September 12, 1920] Institution: National Archives at Boston
379. 6th Advanced Training Course Group Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 1942 Institution: National Archives at Boston
380. 76 MM gun tube burst by hydraulic pressure Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: May 3, 1943 Institution: National Archives at Boston