This company manufactured the Hispano Suiza model A in the United States. Like the one installed on the Wright Martin Type V airplane. (See Hisso as the Hispano-Suiza engines are known in the USA).

From Appendix 9: An American automobile manufacturer that, together with Wright-Martin, manufactured the Hispano-Suiza V8 engine under license during WWI. In fact it was acquired by Wright-Martin.

-A Simplex, American brand logo has been received and is attached to be included in the main text in a future full revision.

“On this plate both brands are related”

From Appendix 12: A better view of the H-3 engine logo plate on display at the Smithsonian in Washington.

“It also indicates the serial number 547”

“The H-3 at the Museum”

-The H-3 was larger, it gave 325 HP. It had a 140 mm bore and 150 mm stroke. Other information says that after improvements the H-3 would reach 375 HP.