Keywords: Patent 8771 image crop.jpg en U S Patent No 8771 drawing cropped for close in of ball bearing mechanism 1852 https //www google com/patents/US8771 dq 8771+Donnell hl en sa X ei OlBsVZDuFo7toATK74KADA ved 0CB0Q6AEwAA U S Patent Office other versions PD-USGov Uploaded with UploadWizard U S Patent drawings |