CountryActionAction DateEffective Date
FRANCESignature21/08/1931
HUNGARYSignature21/08/1931
ITALYSignature21/08/1931
SWITZERLANDSignature21/08/1931
SWITZERLANDRatification28/12/1931
UNITED KINGDOMSignature21/08/1931