# type  = 'Cutting tool type' 
# rpm   = 'Lathe speen in RPM'
# hours = 'Tool life in hours';
A 243 38.7
A 340 33.5
A 381 35.1
A 415 23.1
A 449 27.2
A 470 25.0
A 529 17.1
A 588 11.0
A 612 23.0
A 672 11.1
B 519 40.3
B 522 43.1
B 624 35.9
B 711 36.3
B 712 26.4
B 791 37.7
B 820 20.2
B 900 14.6
B 947 17.1
B 988 11.2