hello, sorry if I ask the question, in my area there is not the German mark Liebherr
even in the used market I have not seen many examples what you can tell me about this brand which would be the classic and historical machines the prototypes
I believe the excavators are similar and have similarities to O & K and poclain the first wheel loaders crawler jcb.to hanomag and zettelmeyer, I'm wrong '
511 /531/521/ the front looks( boom Z) like hanomag / mf first models, the rear axle O & K ronestain and koppel, maybe some collaboration or joint venture was stipulated at the time for the production of these earthmoving machinery, you would have some reference site for old earthmoving machinery thank you