[TowerTalk] AB-252, AB-253, AB-254, AB-255, AB-256, AB-257 aluminum military masts info wanted

[Richard (Rick) Karlquist]

Looking for info on this series of mast sections.
I bought them at a swap meet and have no info except
that the sections are badged with the above model numbers.
Each is 9 feet long, plus an insert into the next
section.  They appear to be designed to work together
as a tapered mast.

Also looking for info on 5 foot sections of aluminum
military mast in 3 inch and 4 inch diameter.  The 4
inch sections have "spline" connections.  Also obtained
at a swap meet.  These are something like the 2 inch
ones you see all the time, only larger.

All of these are the usual olive drab color.

Has anyone seen a PSI stress limit for whatever the
aluminum alloy is that they used for military masts?

Rick N6RK