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All Patents of Type: line levels | |||||
Number | Date | Patentee | Title | Type | |
691,631 | Jan. 21, 1902 | J.H. Jackson | Spirit Level | line levels | |
1,000,512 | Aug. 15, 1911 | I.L. Griswold | Line Level | line levels | |
1,369,652 | Feb. 22, 1921 | F.B. Hall | Octagon Line & Surface Level | line levels | |
1,716,744 | Jun. 11, 1929 | A.L. Stowell | Line level | line levels | |
2,014,709 | Sep. 17, 1935 | F.A. Volz | Line Level | line levels |