Matches in DBpedia 2015-10 for { ?s ?p "Percival Hopkins Spencer (April 30, 1897 – January 16, 1995) was an American inventor, aviation pioneer, test pilot and businessman."@en }
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- Percival_H._Spencer abstract "Percival Hopkins Spencer (April 30, 1897 – January 16, 1995) was an American inventor, aviation pioneer, test pilot and businessman.".
- Percival_H._Spencer comment "Percival Hopkins Spencer (April 30, 1897 – January 16, 1995) was an American inventor, aviation pioneer, test pilot and businessman.".