"D" is for David

The ABC’s of February. “D” is for David. David Nelson Crosthwait Jr. was an engineering pioneer in the field of heating and air conditioning and is best known for heating up Radio City Music Hall. He held 119 patents—39 in the U.S. and 80 internationally—all in relation to heating, cooling, and temperature regulating technology. #blackhistorymonth #blm #onepointfivedays #ABCsofFebruary