Versions of See prior versions of a law on LawServer 2023 Washington Code 18.106.020 – Certificate or permit required — Photo identification — Trainee supervision required — Medical gas piping installer endorsement — Penalty — Notice of infraction 2022 Washington Code 18.106.020 – Certificate or permit required–Photo identification–Trainee supervision required–Medical gas piping installer endorsement–Penalty–Notice of infraction 2020 Washington Code 18.106.020 – Certificate or permit required — Photo identification — Trainee supervision required — Medical gas piping installer endorsement — Penalty — Notice of infraction 2019 Washington Code 18.106.020 – Certificate or permit required — Photo identification — Written warning, penalty — Trainee supervision required — Medical gas piping installer endorsement — Penalty — Notice of infraction 2018 Washington Code 18.106.020 – Certificate or permit required — Photo identification — Written warning, penalty — Trainee supervision required — Medical gas piping installer endorsement — Penalty — Notice of infraction 2016 Washington Code 18.106.020 – Certificate or permit required–Photo identification–Written warning, penalty–Trainee supervision required–Medical gas piping installer endorsement–Penalty–Notice of infraction 2015 Washington Code 18.106.020 – Certificate or permit required–Photo identification–Written warning, penalty–Trainee supervision required–Medical gas piping installer endorsement–Penalty–Notice of infraction 2014 Washington Code 18.106.020 – Certificate or permit required–Photo identification — Written warning, penalty–Trainee supervision required — Medical gas piping installer endorsement–Penalty — Notice of infraction 2013 Washington Code 18.106.020 – Certificate or permit required–Photo identification — Written warning, penalty–Trainee supervision required — Medical gas piping installer endorsement–Penalty — Notice of infraction 2009 Washington Code 18.106.020 – Certificate or permit required–Written warning, penalty–Trainee supervision required — Medical gas piping installer endorsement–Penalty — Notice of infraction
