Cement roofing mortar, in the form of a flexible roofing mortar for roof tiles

identification and data storage systems for items which are movable and/or subjected to varying positions and/or conditions comprised of durable data storage units securable to such items in the nature of touch button memory, contact memory and memory chips; portable devices for reading data from and writing data to such data units in the nature of hand held read/write devices which communicate with durable data storage units by contact therewith; components for identification and data storag...