technology under consideration, should not be stretched too far: while Winston E. Kock was working on sonar for German submarine detection, one of his German counterparts and former colleagues in musical acoustics research in Berlin, Erwin Meyer, was busy developing anechoic coatings for those German submarines to avoid sonar detection. Fritz Winckel, who was also part of the Berlin circle of physicists, acousticians and electrical and electronic engineers in the 1930s working on musical instruments, did research on an autopilot for airplanes and rockets: surely not a ‘defensive’ application if one thinks of the aggressive potential of the notorious German ‘wonder weapons’. Lev Termen did similar research. This and other findings suggest that there is still ample room for more investigation into a fascinating field of historical inquiry.