The waffle iron Bill Bowerman used to a prototype a dimpled rubber sole for running shoes. The waffle trainer became a best seller and helped put Bowerman's company Nike the map. :
Rare Nike 'waffle iron' shoes could fetch $150K at auction | Fox Business
How Betrayal Forced Phil Knight To Create Nike | by James Won | History of Yesterday
Nike P-6000 Bill Bowerman Series Gold Red Women's Shoes Size 6 BV1021-007 | eBay
Bill Bowerman: Founder of Nike | phil knight | Net worth
Nike LDV with "waffle" sole | National Museum of American History
Bill Bowerman, His Wife's Waffle Iron, Nike's Early Days and Birth of the Modern Running Shoe | Natural Running Center
Nike LDV with "waffle" sole | National Museum of American History
Bill Bowerman (Nike Co-Founder) Handmade Prototype Logo Track Spikes With Waffle Sole | The Games | 2021 | Sotheby's
Bill Bowerman (Nike Co-Founder) Handmade Prototype Logo Track Spikes With Waffle Sole | The Games | 2021 | Sotheby's