The Versailles Treaty that ended WWI had a clause where all signatory nations accept that concert A was 435hz.
Art. 282(22).
they had to actually agree on this to end the war ……………
The Versailles Treaty that ended WWI had a clause where all signatory nations accept that concert A was 435hz.
Art. 282(22).
they had to actually agree on this to end the war ……………