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![[Patent application for Gyromatic Radio Compass]](https://digitalcollections.museumofflight.org/files/square_thumbnails/5c38b341e77086e9a51cff9cda54a6be.jpg "[Patent application for Gyromatic Radio Compass]")
Patent application for the Gyromatic Radio Compass submitted by William P. Lear, October 30, 1944. 24 typed pages.
![[Advertisement poster for Learadio aircraft equipment]](https://digitalcollections.museumofflight.org/files/square_thumbnails/4d26f88211d186cf0f03e56ae727664b.jpg "[Advertisement poster for Learadio aircraft equipment]")
Advertisement poster for Learadio aircraft equipment, circa 1931-1939.