History first car to have hydraulic suspension

I just bought the new "Hot Rod Deluxe" magazine and on page 76, there are some photos of a 50 Chevy Fleetline taken back in 1967. Now, one of the captions reads as follows: "Ganahl (Pat) suspects this is one of the earliest cars to feature hydraulic suspension, a forecast of many lowriders to come."
As I recall, there was a article in "Rod and Custom", 10 to 15 years ago about a 56 Corvette called the X-Sonic that was customize in various stages from new to about 1959 or 60. Anyways, the article stated that it was the first car to have a hydraulic suspension, which was operated manually. The article also stated that it was one of the first customs to have a bubble top.
With all of these claims of being "first" got me to wondering, who really did setup the first hydraulic suspension
Shalom

 

I remember reading about that vette.
From my understaning it was the first with an adjustable suspension, made from Port-A-Power jacks

 

X-Sonic was the first.

 

yup x soinc!!

 

Bill Hines