How were the classic mics conceived or invented?
The patents can be found at espacenet.
Then all you have is to prove to the bots that you are human.
A quick way to find is going on advanced search and writing eg Sennheiser and from what year to what year. If memory is correct an example format is 19500101,19600101 for searching from 1950 Jan 1 to 1960 Jan 1.
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