A switching element includes a bubble chamber, a heater and a heat conductor. In such case, by applying material possessing good shielding characteristics, e. After receiving approval, the TKET server generates approved time entries to an accounting department terminal, and if appropriate, to a contract employer terminal so as to trigger invoicing and payment for the employee’s labor. The body carries a first contact exposed directly to the nerve tissue and connected electrically to a terminal of the first coupling assembly.