'PH 4½/4' Ceiling Lamp

'PH 4½/4' Ceiling Lamp
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Copper. Maker's mark: 'PATENTED P.H.-4'. Literature Jørstian, Tina, Munk Nielsen, Poul Erik, 'Taend, PH lampens historie', Gyldendal (Denmark) 1994, pp 166-176.