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       built by Melvin Hofer of Freeman, South Dakota  | 
  
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       built by Melvin Hofer of Freeman, South Dakota  | 
    
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       built by Melvin Hofer of Freeman, South Dakota  | 
  
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       "Beamer" Stirling Cycle Engines built by Students at North Dakota State College of Science in Wahpeton, North Dakota  | 
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       built by Norm Hayden of Seattle, Washington  | 
  
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       built by Bob Verhaeghe of Merritt, North Carolina  | 
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       built by John Mallak of Hutchinson, Minnesota 10/08  | 
  
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       built by John Mallak of Hutchinson, Minnesota 10/08  | 
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       built by Roger Cherrington of New Ulm, Minnesota 12/08  | 
  
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       Key & Sounder built by John Mallak of Hutchinson, Minnesota 07/09  | 
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