Pedro Gruenholz

Centenary of the torsion pendulum

Centenario del péndulo de torsión
OwnerPedro Gruenholz
CountryHungary
Face value12 forinto
Measures4,3x3,1 cms
Year1991
StateUsed
StatusExhibition - Non-transferable
CategoryCommemorations
FormatVertical
Other informationPerforated stamp
visualizations406