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The free-energy device handbook : a compilation of patents & reports
- "Free energy device handbook"
- "Patents"@en
- "Handbooks and manuals"@en
- "The free-energy device handbook : a compilation of patents & reports"
- "The free-energy device handbook : a compilation of patents & reports"@en
- "Free-energy device handbook, The: a compilation of patents & reports"@en
- "The free-energy device handbook"@en