1. Rudolf & Ernestine married 14 Nov 1872. See Genteam.
2. Rudolf Frisch born 18 Sept 1836 in Kleinwarden / Kisvarda Hungary. BillionGraves.com
3. Ernestine Frisch born 6 May 1848. BillionGraves.com
4. Julius Frisch born 5 Oct 1873. See Genteam
5. Paul Frisch born 10 April 1879. See FamilySearch
6. The Frischs vacationed in Baden in July 1884, July 1885 and again in Sept 1902. In 1884 and 1885 they were accompanied by a maidservant.
7. Karl Hnilitschek was listed as employee in Kaufmännisches Zeitschrift, 15 Oct 1885
8. Freemason’s involvement in the Free School in Graz. Grazer Volksblatt 9 March 1906 and Grazer Volksblatt 25 May 1906
9. Julius was a Freemason. See Kodek, Gunter (2009) Unsere Baustein sind die Menschen : die mitglieder der Wiener Freimaurer-logen 1869-1938. Loecker Erhard Verla
10. Rudolf Frisch died 8 Oct 1915. See Funeral notice
11. Julius becomes sole proprietor. Wiener Zeitung 14 Nov 1917
12. Paul and Ludowika get married on 19 Oct 1905. See FamilySearch and register the marriage in Budapest. See FamilySearch
13. Julius resigns Jewish faith 18 Oct 1918. See Genteam.
14. Paul Frisch marries Gisela Ruckendorfer 15 June 1919. See note on birth certificate and Genteam.
15. Liselotte Frisch born 2 Aug 1919. See US emigration form
16. Edith Frisch born 16 Feb 1925 in Berlin.
17. The episodes relating to Orion GbmH and Belzinger Strasse are related in Musgrave, Tony (2004) Into the Darkness, Into the Light. Zircon Books. This is a fictionalised story but I believe all of the facts check out. The ones I was able to check seem to be accurate. Most of the relevant pages are available via Google Books.
18. Liselotte Frisch banned from theatres. See list of non-Aryans excluded from the Reich Theatre Chamber in Lilian & Kant (2004) Hitler's Dancers : German Modern Dance and the Third Reich. Berghahn Books. p287
19. Liselotte Frisch illegitimate Birth. See Bukey, Evan Burr (2010) Jews and intermarriage in Nazi Austria. Cambridge University Press. p43.
20. For more information on how Paul, Gisela, Liselotte and Brigitte were involved in Portois & Fix see Decristoforo, Bernadette (2009): Portois & Fix - A Viennese furnishing company of the modern. Diploma thesis. University of Vienna.
21. Liselotte emigration. See US emigration form
22. Brigitte Frisch born 8 Dec 1948. See Vienna Chamber of Commerce
23. For more information about Brigitte see biography on Vienna Chamber of Commerce