This method dates back to work done in the 1920 's at the United States Army 's aircraft engine development center near Dayton , Ohio .
Ohio /location/location/contains Dayton
DT NN VBZ RB TO VB VBN IN DT CD POS IN DT NNP NNPS NNP POS NN NN NN NN IN NNP , NNP .
Ohio
LOCATION
Dayton
LOCATION
/location/location/contains