2023 Ohio Code 4104.31 – Historical boiler definitions

2020 Ohio Code 4104.31 – Historical boiler definitions

2018 Ohio Code 4104.31 – Historical boiler definitions

2016 Ohio Code 4104.31 – Historical boiler definitions

2015 Ohio Code 4104.31 – Historical boiler definitions

2014 Ohio Code 4104.31 – Historical boiler definitions

2013 Ohio Code 4104.31 – Historical boiler definitions

2009 Ohio Code 4104.31 – Historical boiler definitions