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A Preliminary Summary of the Research Findings Concerning the Introduction and Sale of Electric Toothbrushes, in France
Proposition pour une Etude sur la Brosse a Dents 'Broxodent'
Traction engine designed by Alfred I. du Pont
The American Adventure: Secret of American Production
Gasoline traction engine designed by Alfred I. du Pont
Vorschlag zu einer Motivstudie ueber die Voraussetzungen und Psychologischen Auswinkungen der Bekaempfung der Karies mit 'Anti - Karies - Zuckerwaren'
Vladimir Zworykin Interview
Twentieth Century Black Patentees - A Survey
Etude Motivationnelle sur le Probleme concernant le Lancement d'une Brosse a Dents Electrique en France (French)
Correspondence, calcium carbide
U.S. Patent for battery charger for a cordless electric tool or appliance, Des. 192,427
Cyclostyle
Tools That Shaped America
Motivational Study on the Problem Concerning the Launch of an Electric Toothbrush in France (English)
General Electric news release compilation
Life-preserving Coffin in Doubtful Cases of Death
Klemp coal handling apparatus, Patent 858076