The air conditioning in 1843.
He did not invent the escalator or the fountain pen. He first of all was to busy to invent stairs that move. Second he patented the fountain pen he did NOT invent it
L E Waterman
L E waterman
2181
L.E Waterman
the air conditioning and the fountain pen.
He did NOT invent the fountain pen he patented it. The first fountain pen was invented by a french-man named M.Bion. Lewis Waterman just improved it.
1843 Hope this helps
1837,I hope this helps you!
Yes he did. He invented the fountain pen.
Because they didn't have pens at that time.
he was an American answered by gabby martinez =D HERMOSA ROCKS