An interruptible power supply module, located at a customer’s premise, functions to reduce the demand on a power utility company. Also disclosed are pharmaceutical compositions comprising the histamine-3 receptor ligands, methods for using such compounds and compositions, and a process for preparing compounds within the scope of formula. For this purpose, a measuring system is used that preferably comprises programmable units in order to use the invention flexibly for various machine tools and tools without changing the construction of the measuring system. A multiplicity of protrusions is respectively extended upwardly from the walls.