Poul Henningsen
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a 'PH-4½/4' pendant, Louis Poulsen, Denmark ca 1933.
Copper shades, maker's mark PATENTED P.H.-4. Diameter 45 cm, total height including patinated brass mount with bayonet spring lock, ca 36 cm.
Normal wear, electrical function not guaranteed.
Literature
Tina Jørstian &Poul Erik Munk Nielsen, 'Taend, PH lampens historie', Gyldendal, Denmark 1994, see pp 166-176.
More information
The first years after the patent of the PH-lamp had obtained patent in 1928 the lamps were marked "PATENTED". From ca 1929 the upper shade was produced in new 'half sizes', 3½ and in 1933 4½ (45 cm).