Ball bearings
By: by B. D. Gray and H. Wickland; presented by B. D. Gray, April 14, 1915, at Philadelphia before Electric vehicle association of America.
Contributors: Wickland, H., joint author.; Electric Vehicle Association of America.
Publisher: Printed by Beck engraving co.
Published: 1915
Place of publication: [Philadelphia
Language: eng
Number of pages: 28
Subjects: Ball-bearings.