Falck Claroceptor 1929 AC Noise Line Filter
We found this ad quite interesting. Apparently there were there were AC line noise problems that created a need for filtering devices back in 1929. The more things change the more they stay the same (plus ça change, plus c'est la même chose. Plus c'est la même chose, plus ça change).
Good DX and 73,
|1929 Falck Claroceptor Ad|