Pythagoras Solar’s windows grace the Willis Tower in a pilot project.
[source: http://feeds.sustainablebusiness.com/~r/SBGeneralNews/~3/T8_psUzj_0M/23693]
Pythagoras Solar’s windows grace the Willis Tower in a pilot project.
[source: http://feeds.sustainablebusiness.com/~r/SBGeneralNews/~3/T8_psUzj_0M/23693]
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