… machines, apparatus and appliances in which the heat is obtained electrically (e.g., by the heating effect of a … space or vessel in which a relatively high temperature is obtained. They are used for many purposes (melting, …
… varying from the simplest types which can only add and subtract to more complex machines which can perform the four … principle including, for instance, pocket‑type adding and subtracting devices operated by the selection of numbers …
… joints. (5) Mastics based on zinc oxychloride . These are obtained from zinc oxide and zinc chloride to which … (6) Mastics based on magnesium oxychloride . These are obtained from magnesium chloride and magnesium oxide, to …
