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| Patents for David Gould | |||||
| Number | Date | Patentee | Title | Type | |
| 1,438,234 | Dec. 12, 1922 | D. Gould, W.H. Hart | Joint for Zig-Zag Folding Rules | folding rule joints | |
| 1,438,235 | Dec. 12, 1922 | D. Gould, W.H. Hart | Joint for Zig-Zag Folding Rules | folding rule joints | |
| 1,438,236 | Dec. 12, 1922 | D. Gould, W.H. Hart | Joint for Zig-Zag Folding Rules | folding rule joints | |