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| All Patents in class 297/301.4 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 758,133 | Apr. 26, 1904 | J. Gilson | Spring-back chair | ||
| 764,287 | Jul. 05, 1904 | J. Gilson | Adjustment for backs of type-writer or other chairs | ||
| 2,211,090 | Aug. 13, 1940 | J.M. Altendorf, H.W. Bolens | Chair iron | ||
| 2,329,327 | Sep. 14, 1943 | A.R. Boerner | Posture chair | ||