Ancient Tech Element
Brick + Fire = Oven
Mud + Brick = Oven
Stone + Mud = Oven
Oven + Radiation = Microwave
Oven + Fire = Kiln
Oven + Heat = Kiln
Oven + Clay = Kiln
Oven + Glass = Kiln
Oven + Metal = Furnace
Dough + Oven = Bread