[3]: 48 After 134 years in business, Mosler filed Chapter 11 bankruptcy in August 2001, citing continuing debt problems, and ceased operations shortly thereafter.

Diebold subsequently announced programs to support former Mosler customers[4] and bought most of the original company in bankruptcy court a few months later.

Several Mosler vaults installed in Hiroshima's Mitsui Bank building prior to WWII survived the nuclear attack, a fact the company widely publicized in its marketing.

[7] When the U.S. government began building bunkers and silos during the Cold War, Mosler became the contractor for blast doors.

[8] Mosler built the vault formerly used to display and store the Charters of Freedom: the US Constitution, Declaration of Independence, and the Bill of Rights.