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In the US there were similar developments in the field of engine knock detection for aircraft engines. Attached is a patent from Honeywell from 1946:[URL unfurl="true"]https://patents.google.com/patent/US2523017A/en?q=~patent%2fUS2523017A&before=priority:19510101&after=priority:19450101[/URL]And a another:[URL unfurl="true"]https://patents.google.com/patent/US2508996A/en?q=~patent%2fUS2556471A&inventor=elam&after=priority:19460101[/URL]
In the US there were similar developments in the field of engine knock detection for aircraft engines. Attached is a patent from Honeywell from 1946:
[URL unfurl="true"]https://patents.google.com/patent/US2523017A/en?q=~patent%2fUS2523017A&before=priority:19510101&after=priority:19450101[/URL]
And a another:
[URL unfurl="true"]https://patents.google.com/patent/US2508996A/en?q=~patent%2fUS2556471A&inventor=elam&after=priority:19460101[/URL]
