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Educational Testing Service

Educationa
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US3484950A Teaching machine Expired / Lapsed 1968-06-12 1969-12-23 0 Details
US3382588A Response expression apparatus for teaching machines Expired / Lapsed 1965-01-11 1968-05-14 1 Details