Ricerca semantica
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- Year 1947, n° US-2670711, applied in 1954, by Frederick R. Wittnebert. Fountain pen.
- Year 1948, n° US-2645205, applied in 1953, by Robert W. Randolph. Fountain pen.
- Year 1948, n° US-2598171, applied in 1952, by Philip C. Hull. Nib for writing pens.
- Year 1948, n° US-2528390, applied in 1950, by Galen H. Sayler. Writing inks.
- Year 1948, n° US-2645206, applied in 1953, by David F. Mohns. Writing pen.
- Year 1948, n° US-2620774, applied in 1952, by James A. Mustard. Fountain pen.
- Year 1948, n° US-2533082, applied in 1950, by Marlin S. Baker, Robert W. Randolph. Fountain pen cap.
- Year 1948, n° US-2528328, applied in 1950, by Marlin S. Baker, Robert W. Randolph. Clutch mechanism for mechanical pencils.
- Year 1948, n° US-2612867, applied in 1952, by Marlin S. Baker, Harlan H. Zodtner. Fountain pen.
- Year 1948, n° US-2712299, applied in 1955, by Ernst W. Rickmeyer. Fountain pen.
- Year 1948, n° US-2684052, applied in 1954, by Ernest W. Rickmeyer. Writing instrument.
- Year 1948, n° US-2702021, applied in 1955, by Ivan D. Tefft. Fountain pen.
- Year 1949, n° US-2628431, applied in 1953, by Dave Chapman. Fountain pen cleaning device.
- Year 1950, n° US-2587949, applied in 1952, by Harlan H. Zodtner. Fountain pen.
- Year 1950, n° US-2648309, applied in 1953, by Floyd E. Bartell. Fountain pen.
- Year 1951, n° US-2889810, applied in 1959, by Robert W. Randolph. Fountain pen.
- Year 1951, n° US-2708904, applied in 1955, by Nolan Kent Rhoades. Fountain pen desk set.
- Year 1952, n° US-2774332, applied in 1956, by Ivan D. Tefft. Fountain pens.
- Year 1952, n° US-2905148, applied in 1959, by Marlin S. Baker. Fountain pen.
- Year 1952, n° FR-1076270, applied in 1954, by Nolan Kent Rhoades. Stylographe à plume avec élément capillaire formant remplisseur et réservoir.