Reapers, [13]-[16], [25], [27]-[29], [32], [91], [98], [104], [105], [119], [130], [131], [135], [143], [144], [153], [171]-[174], [207], [237], [241], [252]
Republic Steel Wire Co., [336], [337]
Rice threshing, [2]
Riddle, grain separator, [214]
Roberts-Mackensen bee inseminator, [414]
Robinson, Cora E., donor, [123]
Robinson, Lucy, donor, [205]
Rogers, Noah, [11]
Roller(s), for butter worker, [345];
for cookies, [93];
for soil, [21], [129]