Abstract: An information processing apparatus includes a processor configured to use authentication information of a first user for using an electronic signature service to acquire contract information regarding a contract of the first user being a contract requesting source for a second user being a contract requesting destination from the electronic signature service, and include extension information other than information acquirable by the second user through the electronic signature service in the acquired contract information to allow the second user to use the extension information.

Abstract: An information processing apparatus includes a processor configured to use authentication information of a first user who is registered in plural electronic signature services and uses the electronic signature services, to acquire at least one of contract information regarding a contract using each electronic signature service or service information, from each electronic signature service, the authentication information being provided for each of the electronic signature services and used for using the electronic signature service, and the service information being information regarding each electronic signature service, display a check screen in association with the acquired at least one of the contract information or the service information and the electronic signature service as an acquisition source, the check screen being used for checking the plural electronic signature services, and receive selection of the electronic signature service used by the first user on the check screen.

Abstract: The vibrating element comprises a pair of exciting electrodes having opposing effective portions formed on the opposing major surfaces of a piezoelectric plate, and vibration adjusting members disposed on at least one of the exciting electrodes. The vibration adjusting members are made of the same material as the exciting electrodes and do not project beyond the contour of the effective portions in the direction of propagation of the vibration energy of the vibration but project in a direction perpendicular to the direction of propagation.

Abstract: A piezoelectric vibrator unit has a substantially flat holder case which is provided on one side with a recess or recesses each encasing a piezoelectric vibrator plate. The bottom wall of each recess is provided therethrough with a port or ports each at a position which corresponds to an excitation electrode formed on the vibrator plate. Another side of the holder case is used for masking means for forming, for the micro-adjustment of vibration frequency, a vacuum evaporated film on the excitation electrode.