A system including a server to receive a request representing changes to data residing at a device. The electronic document comprises first and second sets of pages, in which the first set of pages has a first characteristic and the second set has a second characteristic. The sealing mechanism is fitted with a nose bridge saddle designed to rest on the bridge of the users nose and to align the discharge nozzle with the central portion of the ocular opening of either of the users eyes when the attaching hinge is in the fully open position. using a Fourier transform, and a characteristic of the acoustic signals is used to identify lithology, rock strength, presence of oil, presence of gas, change in lithology, or the like. The armature can be displaced with respect to the axial guide element between a flange of the intermediate body and a projection element of the guide member, for eliminating the rebounds of the openclose element upon closing of the solenoid valve. In a data transmitting system, a specification information packet for specifying a content source used, plural packet sequences each attached with identification information, and a correspondence information packet for relating the content sources with the identification information are multiplexed with on on-air stream, which is transmitted to each receiving system via a network.