Adolf Froelich was a Polish inventor, dentist

Dentist

A dentist, also known as a 'dental surgeon', is a doctor that specializes in the diagnosis, prevention, and treatment of diseases and conditions of the oral cavity. The dentist's supporting team aides in providing oral health services...

 and participant in the Polish-Soviet War

Polish-Soviet War

The Polish–Soviet War was an armed conflict between Soviet Russia and Soviet Ukraine and the Second Polish Republic and the Ukrainian People's Republic—four states in post–World War I Europe...

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Curriculum vitae

Adolf Froelich was born in Łaziska, Opole Lubelskie County, Poland, to parents Reinhold Froelich and Antonina Wilhelmina Józefina Froelich (née Majewska).
He studied brewing technology

Brewing

Brewing is the production of beer through steeping a starch source in water and then fermenting with yeast. Brewing has taken place since around the 6th millennium BCE, and archeological evidence suggests that this technique was used in ancient Egypt...

 at the scientific department Weihenstephan of the University of Technology Munich in Freising

Freising

Freising is a town in Bavaria, Germany, and capital of the district Freising. Total population 48,500.The city is located north of Munich at the Isar river, near the Munich International Airport...

. Furthermore he studied dentistry

Dentistry

Dentistry is the branch of medicine that is involved in the study, diagnosis, prevention, and treatment of diseases, disorders and conditions of the oral cavity, maxillofacial area and the adjacent and associated structures and their impact on the human body. Dentistry is widely considered...

. He got his dentist approbation in 1918. As a dentist he worked inter alia in Jędrzejów

Jedrzejów

Jędrzejów is a town in Poland, located in the Świętokrzyskie Voivodeship, about 35 km southwest of Kielce. It is the capital of Jędrzejów County. It has 18,069 inhabitants ....

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In 1932 he invented the double propeller

Propeller

A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid is accelerated behind the blade. Propeller dynamics can be modeled by both Bernoulli's...

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He was officer (rank: lieutenant) of the Polish Armed Forces

Polish Armed Forces

Siły Zbrojne Rzeczypospolitej Polskiej are the national defense forces of Poland...

. As a dentist he took part in the Polish-Soviet War

Polish-Soviet War

The Polish–Soviet War was an armed conflict between Soviet Russia and Soviet Ukraine and the Second Polish Republic and the Ukrainian People's Republic—four states in post–World War I Europe...

 being a member of the 9th Infantry Division

9th Infantry Division (Poland) (interwar)

The 9th Infantry Division was a unit of the Polish Army in the Second Polish Republic. The division was originally formed in 1919. Stationed in Siedlce, it took part in the Polish September Campaign under Colonel Józef Werobej....

. He died in Warsaw

Warsaw

Warsaw is the capital and largest city of Poland. It is located on the Vistula River, roughly from the Baltic Sea and from the Carpathian Mountains. Its population in 2010 was estimated at 1,716,855 residents with a greater metropolitan area of 2,631,902 residents, making Warsaw the 10th most...

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