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Subject (Local Yale)
- Patents29
- Patents United States21
- Helfand, William H., 1926- Ownership17
- Patents Italy14
- Patents Germany13
- Patents Hungary10
- Patents France8
- United States. War Dept. Record Division Stamp7
- Patents Great Britain5
- Patents United States Cases5
- Bingham, Hiram, 1875-1956 Ownership4
- Brinley, George, 1817-1875 Ownership4
- Copyright4
- Patents Austria4
- Patents Soviet Union4
- Patents Switzerland4
- Provenance United States. War Dept. Record Division. Rebel Archives4
- Pugsley, Edwin Ownership4
- Telephone United States Cases4
- Trade-marks Germany4