mills -- treadmills	1943: 238 1955: 202, 233 1956: 7, 12, 58, 197, 240
mills -- treadmills --- dogs	1956: 50, 163
mills -- treadmills --- goats	1956: 163
mills -- treadmills --- Hauppauge	1956: 12
mills -- treadmills --- horse and ox	1955: 109
mills -- treadmills --- Three-horse treadmills ---- letter by Wilson L. Glover	1956: 240(L)