Y
X WAS A SWISS INVENTOR. HE WAS INTERESTED IN BALLOONING, PRESSURE,ETC. HE ALONG WITH HIS SON INVENTED SOMETHING_______. THEY INVENTED ANOTHER IMPROVED VERSION OF THIS LATER(THE INTERNAL DESIGN FOR THE IMPROVED VERSION IS GIVEN IN Y). THE INVENTION WAS LATER SOLD TO THE US NAVY. WHO IS X? WHAT DID HE INVENT?
