Crane Manufacturer - Maertens

[gjb1]

I am trying to track down a German crane manufacturer called "Maertens". This trade name is on an old crane so it's likely that they have probably been taken over by someone else or gone out of business. I have done the usual intnet searches and haven't been able to come up with any contact details.

Any help in finding contact details or any other information would be greatly appreciated.

Regards

gjb