For use as an additional internal extension bell. Nicknamed 'Cow-Gongs' because the have a distinctive 'two-tone' ring, not unlike the sound of Swiss cow bells.
GPO Bell No.64 'Cow Gongs'
(General Post Office)
1936
For use as an additional internal extension bell. Nicknamed 'Cow-Gongs' because the have a distinctive 'two-tone' ring, not unlike the sound of Swiss cow bells.