Galvanic corrosion is a process that degrades metals electrochemically. This corrosion occurs when two dissimilar metals are located in contact with each other in the presence of an electrolyte, such as salt water, forming a galvanic cell.
But the memories of that tragic day 25 years ago are still vivid to many in Edmond. On Aug. 20, 1986, gunman Patrick Henry Sherrill shot and killed 14 co-workers, wounded six and then took his own life inside the post office where he worked.
NOTE: In 1855 the first Harmony Post Office opened in a building located on the present site of. 212/214 Putnam PIke. (See that location for more information.) In 1870 the Harmony Post Office was. located at 199/201 Putnam Pike.