U/c ground locks, history and research query
Possibly one of the more obscure queries posted on here, but, hopefully, some relevant facts may emerge.
In essence, I am trying to help a friend engaged in a research project regarding the introduction, development, material specs, design(s), loadings and overall history / origins of the humble u/c ground lock.
Not the most enticing of subjects I know, but, any reference material, guides, or indeed design knowledge would be appreciated please.
Also being posted on the AH and N forum.
Many thanks.
K n C