US4139321 Rock channel heat storage
Cited prior art · Frank D. Werner · United States · 1979
W. N. N \a V. N. Y w N NN N N Page 2 Drawing sheet — no readable text. Page 3 Z2/27 s:-- 52, ses 2/
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US4024910 Rock channel heat storage
Cited prior art · Frank D. Werner · United States · 1977
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