Houwink, Roel is involved in

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Identifier | Title | Date | Event type | Other information | |
|---|---|---|---|---|---|---|
| KBA 9335.335 | 29th Mar 1935 | Creation | ||||
| KBA 9346.424 | 24th Apr 1946 | Creation | Protection period until: 2031 | |||
| KBA 9356.623 | 7th May 1956 | Creation | Protection period until: 2041 |
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