Latest Tetratab Casebook 3 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 6.0.1; CASEBOOK_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.120 Safari/537.36	Chrome 91	Android 6
Mozilla/5.0 (Linux; Android 6.0.1; CASEBOOK_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.101 Safari/537.36	Chrome 87	Android 6
Mozilla/5.0 (Linux; Android 6.0.1; CASEBOOK_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36	Chrome 86	Android 6
Mozilla/5.0 (Linux; Android 6.0.1; CASEBOOK_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.92 Safari/537.36	Chrome 77	Android 6