HAMBURG/BERLIN — Continental played a big part in the Nazi’s armaments and war economy, using forced laborers to make products such as gas masks, a study presented by the company showed on Thursday.

Continental commissioned the independent research by historian Paul Erker to explore the darkest chapter of the company’s history. It provides an opportunity to learn from the past to create a better future, the company said.

“The study shows that Continental was an important part of Hitler’s war machine,” Continental CEO Elmar Degenhart said.

The research, which included units VDO, Teves, Phoenix and Semperit, which were not part of Continental at the time, exposed how corporate culture was distorted and how the company shifted from making products for the Nazi’s consumer society to arms.

The supplier used 10,000 forced laborers during World War II from occupied Belgium and France as well as Soviet prisoners of war, showed the study entitled “Supplier to Hitler’s War. The Continental Group in the Nazi Era.”

In the last years of the war, concentration camp inmates made gas masks and shifted production to underground sites with inhumane living and working conditions, the study said.

Many German companies profited from forced labor as prisoners worked in abominable conditions for little or no pay. Many died.

It took Germany until 2000 to create a forced labor compensation fund which had paid more than 4.37 billion euros ($5.2 billion) to around 1.7 million victims by 2007. Contributors included Volkswagen Group, Deutsche Bank and Bayer.

Thousands of companies supported Hitler’s war economy. Some bankrolled the effort, others manufactured arms or even chemicals like Zyklon B, used in gas chambers.

“Business has a responsibility to help preserve democracy,” Degenhart told journalists, adding the study would feed into training programs to promote social responsibility and help tackle racist and radical views.