https://pubchem.ncbi.nlm.nih.gov/patent/EP-0140209-B1
Tapped transformer with a non solidly earthened neutral point - Patent EP-0140209-B1 - PubChem
EP-0140209-B1 chemical patent summary.
https://www.nodc.noaa.gov/archive/arc0083/0140209/1.1/data/
Index of /archive/arc0083/0140209/1.1/data
index ofarchivedata