| 摘要 |
500,981. Rectilinear-motion bearings. JUDGE, T. O., HAND, H., and HAND, J. D. Aug. 25, 1937, No. 23292. [Class 12 (i)] [Also in Group X] Ball-bearings for sliding doors comprise balls 25 running or ball-bearings 27 in casings 26 secured to the bottom rails of the doors by flanges 29 and screws &c. 30. The balls run on metal-lined. tracks in the sill.
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