Patents
Patents filed since that cite Meyer's. Most are other people's work, and an examiner chose many of them during prosecution rather than the applicant volunteering them.
Citation index — what each of Meyer’s filings cites, and every later patent citing it.
3 patents from 1990 · every year
1990 · 3
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DE9010429U1
collector
Germany · 22 Nov 1990 · indexed, no text held
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DE9010407U1
Solar collector
Germany · 13 Sep 1990 · indexed, no text held
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DE3832494A1
Method and apparatus for feeding a gas burner with a mixture
Germany · 29 Mar 1990 · indexed, no text held