Season 20 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #10 of 13 in Season 20•−0.1 vs season avg
Molten iron is cast into heavy bathtubs before the surfaces are cleaned and coated with durable enamel. Cottonwood roots are carved and painted into traditional Hopi Kachina dolls; enormous mine-truck engines are dismantled, inspected, repaired and reassembled; and semiconductor chips are mounted, enclosed and tested

Lynne Adams
Narrator (voice)
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"Cast Iron Tubs, Hopi Kachina Dolls, Mine Truck Engine, Memory Cards" is episode 10 of How It's Made season 20. It scored 7.4/10 from 20 votes, ranking #10 of 13 episodes this season (season average 7.5). It aired on January 3, 2013.