US664512A Chasergrinding machine. Google Patents
US664512A USA USA US664512A US 664512 A US664512 A US 664512A US A US A US A US A US A US A US 664512 A US664512 A US 664512A Authority US United States Prior art keywords chaser gage holder grinding machine screw Prior art date Legal status (The legal status is an assumption and is not a