AMERICAN KEYS.
061..... American J5 Flame Proof Army key. Dated 1941.
110..... A fine key made by Signal Electric Co. Mitchigan.
128...... American Flame Proof key, used by the US Air Force circa 1943.
140. American Telegraph key made by AT&T Co.(American Telephone and Telegraph Company).
141...... American Telegraph Key made by J.H. Bunnell, New York.
142...... American Military Key "J-37".
143...... American Military Key "J-38".
173...... American Telegraph Key.
174...... Telegraph key made by Signal Electric Mfg. Co. Mitchigan.
175...... American "Speed X" key made by LOGAN.
178. ..... American Telegraph key made by Signal Electric Mfg. Co. Michigan.
179...... American Telegraph key made by Signal Electric Mfg. Co. Michigan. With Navy Knob.