Which era of Thinkpad? Someone spilled a full glass of red wine all over my X31 while it was turned on and it was fine the next day (same machine survived much

Which era of Thinkpad? Someone spilled a full glass of red wine all over my X31 while it was turned on and it was fine the next day (same machine survived much other abuse, including being thrown down a flight of stairs). That machine is still running and the keyboard is still better than even most of the newer Thinkpads.