| Patents for H. H. Doubleday |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 88,535 | Apr. 06, 1869 | A.P. Barlow | Reciprocating mechanism for sawmill | sawmills |
| 107,255 | Sep. 13, 1870 | H.J. Harris | Improvement in Multiple Tool | combination tools |
| 114,085 | Apr. 25, 1871 | S.A. Drake, I. Almy | Improvement in Plane-Irons | plane blades |
| 128,417 | Jun. 25, 1872 | R. Nichol | Improvement in Combined Rules and Dividers | dividers |
| 198,825 | Jan. 01, 1878 | C.W. Thompson | Improvement in barrel-hoop machines | hoop making machines |
| 205,923 | Jul. 09, 1878 | C.W. Thompson | Improvement in machines for making barrels | barrel making machines |
