Kasey Tross Kasey is a trained Community Emergency Response Team (CERT) member and a freelance writer with expertise in emergency preparedness and security. As the mother of four kids, including two teens, Kasey knows the safety concerns parents face as they raise tech-savvy kids in a connected...
US4672215 * Feb 27, 1986 Jun 9, 1987 Spectra-Physics, Inc. Hand held laser bar code reader with safety shutoff responsive to housing motion detectorUS4672215 1986年2月27日 1987年6月9日 Spectra-Physics, Inc. Hand held laser bar code reader with safety shutoff responsive to housing motion ...