According to Vačkář, oscillators of this kind were independently developed by several inventors, and one developed by Gouriet had been in operation at the BBC since 1938.
根据Vačkář的文献， 此类振荡器是几个发明者自主开发的，其中由Gouriet开发的那个振荡器从1938年就一直在BBC工作。