Very nicely done, and shown, Ralph!

The first, and probably the last time, I saw those types of jacks was around 1960.
They were being used by the maintenance crew, where I was a young apprentice.......
I watched them
carefully, jack a long, 60'+(?), centre lathe, onto skate blocks. And,
gently move it down the shop to the doorway.
The crane/ transport crew, slung it at either end, and started to lift it onto the transporter.
With a loud bang. The bed broke in two!

David D