Lahive & Cockfield
Gas burner
 A gas burner assembly including a main burner, a catalyzer and an after burner has a fire guide formed on a boundary between porous flame plates. 
Toho Gas Co., Ltd. Paloma Kogyo Kabushiki Kaisha
F
F24C
inventional
Yoshihiro Masafumi Mitsuo Hideo
Mori Matsubara Tsuchiya Itami