Patents for Frederic Ayres Johnson


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Patents for Frederic Ayres Johnson
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
666,315	Jan. 22, 1901	F.A. Johnson	Method of Construction of Electric Motors	electric motors
672,419	Apr. 16, 1901	F.A. Johnson	Means for Controlling Electric Motors	motor controls