Conversation so far:
How many aircraft did Glenn Curtiss's factory produce during World War 1?
Curtiss created the JN-4 "Jenny" for the Army, and the N-9 seaplane version for the Navy.
How many employees did his company employ in Buffalo during World War 1?
18,000 workers in Buffalo.

Question: What year was the Curtiss NC designed?
Self-contained rewrite: What year was the Curtiss NC designed by Glenn Curtiss?