Law came into effect in December 1884. It provided for compulsory participation by all industrial wage earners (i.e., manual laborers) in factories, ironworks
Energy efficiency policies and measures in Germany (PDF). Karlsruhe, Germany: Fraunhofer Institute for Systems and Innovation Research ISI. 2012 [2016-05-01]
Shackleton Energy Company has established operational plans, an extensive teaming and industrial consortium for developing LEO Propellant Depots supplied by Lunar
Czechoslovakia, East Germany, Hungary and Poland (Routledge, 2013). Steiner, André. The Plans That Failed: An Economic History of East Germany, 1945–1989 (2010)