Fotoatelier in
- Bydgoszcz (Bromberg), Wilhelmstraße 15
"The first owner of the house at Wilhelmstraße 15 was Louis Mallachow, a dentist living at Danziger Straße 14. Later on, in the 1880s the building became the property of Theodore Joop, a famous photograph who had its workshop there. His firm survived his death, taken over by Paul Nawrotzki and Emil Wehr." - https://en.wikipedia.org/wiki/Marshal_Ferdinand_Foch_Street,_Bydgoszcz, 02.04.2023. An gleicher Stelle auch eine Annonce, in der Theodor Joop angibt: "Gegründet 1860" und "Früher Th. Joop & Co."
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