Austin Company Pens Accord to Provide Roof Top Wind Turbines for Ninety Thousand Square Feet Warehouse. BUILDING TURBINES CORP (OTC PINK: B L DW) Works on the Study and Construction of Patented Rooftop Wind Turbines. Tick: B L DW Price: $.038 Name: Building Turbines Long Term Target: $0.25 Trade Date: August 5th Renewable Energy Company Ripe To Jump When Market Opens!