These included the sack closures invented by Walther Haver in 1911, which were not only ideal for closing flour and potato sacks, but also for closing cement sacks. The so-called eyelet wire was sold successfully in the Beckum cement industry - at the beginning of the 20th century, 33 cement works were still in operation there. The advantages of the eyelet wire were also convincing abroad, and it was even exported to the United States. The product became one of the main pillars of the company.
On a sales trip to the USA, Fritz Haver heard about the invention of the valve paper bag. He realized that this development would sooner or later make the eyelet wire superfluous oder obsolete. The owner of a bagging company, Mr. R. P. Bushman, stopped ordering eyelet wire for the first time in 1925 because he had developed a valve bag packing machine. He asked his business friend Fritz Haver if he knew of a machine factory in Germany that could build this machine. Erich and Fritz Haver recognized the opportunity for Haver & Boecker and boldly replied that they would be able to start manufacturing such a machine themselves. It was the birth of the machine factory.