Founded in 1838 by Philipp Furtwängler, the Furtwängler & Hammer company became a significant name in the organ building industry. Pius Furtwängler, the second son of Philipp, partnered with organ builder Adolf Hammer in 1883, establishing the workshop as P. Furtwängler & Hammer. This partnership saw the workshop relocated from Elze to Hanover. Pius Furtwängler left the company in 1892, and Adolf Hammer, who was later awarded the title of Hoforgelbaumeister, led the company until his death in 1921. The firm flourished under Hammer's leadership, known for building notable instruments like the organ for the Braunschweiger Dom, later moved to St. Mary's Church in Hanover.

In 1937, Emil Hammer, Adolf Hammer's nephew, took over the company and rebranded it as Emil Hammer Orgelbau. Under Emil's guidance, the company continued to thrive, transitioning from pneumatic to electro-pneumatic systems, and becoming involved in the Orgelbewegung, a movement emphasizing historical organ principles. After Emil's death, his grandson Christian Eickhoff led the firm, relocating it to Arnum in 1966. The company, despite facing challenges, including an eventual sale and dissolution, left a legacy of over 2,200 organ works worldwide, combining innovation with tradition in organ building.

https://de.wikipedia.org/wiki/Emil_Hammer_Orgelbau