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"4-in-1" Vacuum Engines" built by Students at North Dakota State College of Science in Wahpeton, North Dakota |
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"Mini Stirling Fans" built by Fritz Werner Memorial Group Students in Richmond, Indiana |
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built by Ron Schindele of Prescott Valley, Arizona |
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built by Olaf Vonstritzky of Trenton, Michigan |
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built by Ken Hollenbeck of Sister Bay, Wisconsin |
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built by Joe Kalke of Maryville, Tennessee 01/07 |
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built by Andy Hidley of Weatherly, Pennsylvania 01/08 |
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