JPH0639620A End mill Google Patents
JPH0639620A JP17391092A JP17391092A JPH0639620A JP H0639620 A JPH0639620 A JP H0639620A JP 17391092 A JP17391092 A JP 17391092A JP 17391092 A JP17391092 A JP 17391092A JP H0639620 A JPH0639620 A JP H0639620A Authority JP Japan Prior art keywords blade tool angle cutting hardness Prior art date 19920309 Legal status The legal status is an assumption