ThinkPad Laptop R Series Intel Pentium M 740 (1.73GHz) 512MB Memory 40GB HDD ATI Mobility Radeon X300 14.1" Windows XP Professional R52 (18472FU) - Newegg.com
R52 still usable in 2023 : r/thinkpad
IBM Thinkpad R52 Fan Repair Guide | Installation Video