Okay, another recap:
- We know that it is an American steam-powered flying machine dating from 1904.
- That patents, covering the design concept for the airship itself, and for the steam engine, were granted in the same year (which was not 1904).
Time for more clues:
- It was built and tested at a spot north of San Francisco, California.
- The patents (which were granted sometime between 1900 and 1903) have the inventor listing an address in New Mexico as well as in California.
NB: some sources have the craft dating from 1903, but the only contemporary article I've found about it dates from late 1904, so I'm using that year.
Paul