ELECTRICAL HEATING EQUIPMENT AND APPARATUS FOR LABORATORY AND SCIENTIFIC USE-NAMELY, HEATING MANTLES, HEATING TAPES, ARMOURED HEATERS, WATER, AIR, AND HISTOLOGICAL BATHS, APPARATUS FOR SOXHLET, KJELDAHL AND OTHER TESTS, TEST TUBE HEATERS, HEATING PANELS AND PADS, PYROMETERS AND ENERGY REGULATORS FOR CONTROL OF SUCH APPARATUS AND EQUIPMENT