Please select the most similar patent number from A, B, C and D. Which number is?
A stamp comprises: a stamp case (10), the lower end of which is provided with an accommodation cavity (100); a stamp handle (20), provided on the upper side of the stamp case (10); a columnar core (30), running through the stamp case (10), the upper end of the columnar core (30) being connected to the stamp handle (20); a spring (40), provided between the stamp handle (20) and the stamp case (10); a clamping plate (50), formed at the lower end of the columnar core (30) and accommodated inside the accommodation cavity (100) of the stamp case (10); a stamp bucket (60) for storing ink, clamped to the clamping plate (50) and accommodated inside the accommodation cavity (100). A stamping surface is provided at the lower end of the stamp bucket (60), and ink absorbing cotton is disposed inside the stamp bucket. When the stamp bucket (60) is at an upper stopping point, the clamping plate (50) is spaced from the upper stopping point by a distance; and therefore, the clamping plate (50) can be driven upwards by continuously pushing the stamp handle (20) upwards, so that the clamping plate (50) is separated from the stamp bucket (60).
A: A sealing-type radio-frequency electronic seal, comprising a backing paper layer (1). A conductive coating (2) is provided on the backing paper layer. A plurality of hollows (3) are formed in the middle of the conductive coating, and an antenna resonant cavity (4) is formed by an opening at one end of one of the hollows, the antenna resonant cavity being connected to a chip connection strap assembly (5) at the opening. The electronic seal facilitates recognition, has a simple manufacturing process and a low cost, and is easy to popularize, and the seal is thin, thereby having no influence on the aesthetic feeling of calligraphy and painting artworks and having the characteristic of preventing it from being used twice.
B: A method, apparatus, and device for recognizing seal text, and a computer-readable storage medium, the method comprising: acquiring a seal detection result of an object to be processed, the seal detection result comprising a seal detection frame and angle information of the seal detection frame (101); on the basis of the seal detection result, obtaining a seal image in a forward seal detection frame (S102); acquiring the outline of at least one text line in the seal image (103), and cutting out a text line image according to the outline of the at least one text line (104); and performing text recognition on the text line image to obtain a text recognition result (105).
C: A seal management method, comprising: receiving a seal use application form sent by a first terminal, the seal use application form carrying an institution name and a seal type, and the seal type comprising a physical seal (202); acquiring a corresponding order sending queue which comprises a seal user identifier according to the institution name, and sending the seal use application form to a second terminal corresponding to the seal user identifier (204); receiving a query request for the physical seal uploaded by the second terminal, and obtaining a storage position and the current state of the physical seal according to the query request (206); and if the current state is an available state, recording the duration of the physical seal leaving the storage position, and if the duration exceeds a preset effective time, marking the physical seal as in an abnormal state (208).
D: An intelligent seal protection control device and a seal management system. The seal management system comprises: an application terminal (11) for sending a seal usage request, an authorization management terminal (12) for approving seal usage authorization and an intelligent seal protection control device (13) for affixing a seal; the application terminal (11), the authorization management terminal (12) and the intelligent seal protection and control device (13) communicate via a wireless network; and all the authority settings are completed via the seal authorization management terminal (12). In addition, a seal management server (14) for managing and maintaining the intelligent control device usage system can be configured. The seal management system provides possibilities of a seal management remote operation by means of network authorization authentication, achieves accurate tracking of a location, supervision, authorized use and secure storage of a seal, reduces the risk during use via an alarm, simplifies seal approval procedures, and improves the flexibility of seal usage, thereby satisfying the requirement for office working with a low degree of hierarchy in the information society, and improving the work efficiency.
Answer: A