List of How It's Made episodes Season 21: 2013 Season 21: 2013

| Series_Ep_ | Episode | Segment_A | Segment_B | Segment_C | Segment_D |
|---|---|---|---|---|---|
| 21-10 | 270 | Customized Knee Replacements | Leaf Springs | Lavender Essential Oil | Rivets and Rivet Tools |
| 21-11 | 271 | Cast Iron Stoves | Ultralight Aircraft | Snow Groomers | Rubber Bands |
| 21-12 | 272 | Barber Chairs | Sewage Pumps | Bimini Boat Tops | Diesel Filters |