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photocell [photocells]▼◼◼◼noun[UK: ˈfəʊ.təʊ.sel] [US: ˈfoʊto.ʊ.sel]
phototube▼noun[UK: ˈfəʊ.təʊ.ˈtjuːb] [US: ˈfəʊ.təʊ.ˈtjuːb]
photovoltaic cells▼◼◼◼
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