Szekely Aircraft Corporation 1928 Radial 3 S-R-3, Radial 5 S-R-5 Brochures For Sale

Szekely Aircraft Corporation Aircraft Engine Division Holland MichiganInformation booklets / Catalogues / Brochures for aero engines S-R-3 Szekely Radial 3 (3 cylinder radial aero engine) and for S-R-5 Szekely Radial 5 (5 cylinder radial aero engine)
Each booklet has a fold-out page. Approximately 11" X 8-1/2" when folded.
2 booklets are glued together - not sure if it was published that way or if it was glued together laterEach booklet has a fold-out page.
Good condition. No large rips, tears. Has some pencil markings. Slightly soiled - especially on the last page.