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| Spain Patent | |||||
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| Number | Date | Patentee | Title | Type | |
| ES-50,668 | Sep. 01, 1911 | B. Forge Co. | Improvements in the Rotary Machines. | rotary engines | |
| ES-173,539 | Oct. 01, 1946 | . | Apparatus For Igniting Combustible Gaseous Mixture Generated By A Burning Apparatus | stationary boilers | |
| ES-286,698 | Oct. 16, 1963 | . | Boiler | stationary boilers | |
| ES-291,870 | Feb. 16, 1964 | . | Liquid Fuel Atomizing Injector Apparatus | stationary boilers | |
| ES-2,002,844 | Oct. 01, 1988 | C.R. Bradlee | Multi-roll levelling device | ||