In a monolithic LC filter, bent portions of external electrodes are formed by applying and firing a conductive paste in the areas of first to eighth bent segments that are formed by pattern printing, photolithography, or a thin-film forming method. User-created notes are enriched with labels, context traits, and relevant data to minimize friction in the note-taking process. The magnetic refrigerant material includes a first element Mn, a second element As and a third element to substitute for a portion of the second element, and exhibits a magnetic phase transition in a temperature range from about 230 K to less than about 318 K. In particular, the portion of the firewall device in which decryption takes place is defined such that contents of the portion are inaccessible to an operator of the firewall device. Methods of use and implantation also are provided.