301. 3" AA T4 in traveling position Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: February 7, 1938 Institution: National Archives at Boston
302. 3" AA T4 in traveling position Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: February 7, 1938 Institution: National Archives at Boston
303. 3" AA T4 in traveling position Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: February 7, 1938 Institution: National Archives at Boston
304. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
305. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
306. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
307. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
308. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
309. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
310. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
311. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
312. 305 MM RR mount Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: April 15, 1920 Institution: National Archives at Boston
313. 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
314. 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
315. 305 MM sliding railway mounts 3 and 4 Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: [ca. 1908–1926] Institution: National Archives at Boston
316. 34 year old floor mill machining 3" AA bogie Creator: Watertown Arsenal (Mass.) Format: Photographs Collection: Watertown Arsenal Photographs Date: December 22, 1938 Institution: National Archives at Boston
317. 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
318. 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
319. 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
320. 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