The origin of Elektrotechnische Fabrik Jakob Einstein & Cie was the water and gas installation company founded in 1876 by Jakob Einstein in the same year he moved from Stuttgart to Munich. In 1879/1880, his brother Hermann Einstein (father of Albert Einstein) joined the company as a partner, and in the next five years turned it into Elektrotechnische Fabrik Jakob Einstein & Cie " a factory for electrical equipment, specializing in the generation of direct current and its use for the then new electric lighting of streets, taverns and beer tents.

Hanna Kapitalnik (*1910 in Łódź [dt.: Lodz or Lodsch]), the daughter of Abraham and Perel Kapitalnik, lived since spätestens 1929 in the Idastraße 27. In 1934 she was no longer listed in the residents' book of Greiz. Hanna was murdered in the Shoah.

In the Reichenbacher Straße 12 had the raw products dealer Israel Kapitalnik 1929 his business called "I. Kapitalnik raw products shop". In 1934 the business was no longer listed in the Greiz address book.

Israel Kapitalnik lived since 1929 at the latest in the Reichenbacher Stra;e 12, where also his business "I. Kapitalnik Rohproduktenhandlung" was located. In 1934 he was no longer listed in the Greiz address book.

The raw products dealer Israel Kapitalnik lived since spätestens 1926 in the Reichenbacher Straße 18. Between 1926 and 1929 he moved few Häuser further in the Reichenbacher Straße 12.

Abraham Kapitalnik owned the raw products shop "Kapitalnik & Co., Textilabfälle" in Weberstra;e 10. In his shop he bought skins, rags, wool waste, waste paper, iron and metals. In 1934, the shop was no longer to be found in the address directory of Greiz.

Abraham Kapitalnik (*1881), a raw products trader, moved to Idastra;e 27 between 1926 and 1929. By 1934 he was no longer listed in the Greiz address book. Abraham Kapitalnik was murdered in the Shoah.

The raw products dealer Abraham Kapitalnik (*1881 in Łódź [dt.: Lodz or Lodsch]) lived since spätestens 1921 in the Weberstraße 10, where also his business "Kapitalnik & Co., Textilabfälle" was located. Between 1926 and 1929 he moved to Idastraße 27. With his wife Perel he had their daughter Hanna in 1910.

Dr. med. prakt. Alex Rosenbaum had an ENT practice and a private clinic at Carolinenstra;e 26 - see Flach 1990 (sources). Previously, his practice was located at Oststra;e 19. 
In 1937, Dr. Rosenbaum and his practice were no longer listed in the Greiz address book.