Abstract: A valve safety lockout device and a method for using such device to tamper-proof a control valve are disclosed. In the device, a hollow toroidal-shaped body that is divided into two equal halves circumferentially forms the body for the lockout device. A plastic molded-in hinge connects the two equal halves at one end, and a male latch member and a female latch member are each formed at an opposite end of the two halves such that once they are engaged together, the two halves cannot be detached without destroying the latch members and thus making it visible to an operator. The plastic hollow body of the lockout device can be suitably molded of a plastic material of high rigidity including a molded-in plastic hinge connecting the two halves together. The rigidity of the plastic material should be such that the lockout device cannot be compressed or squeezed in order to turn the control valve handle.

Abstract: The present invention provides a cryptosystem for encrypting an original image or voice file by using a camouflaging image or voice file. Each of the original and camouflaging files comprises a plurality of basic units arranged according to a predetermined sequence. The cryptosystem comprises a memory for storing the original and camouflaging files and programs, a processor for executing the programs stored in the memory, and an encrypting program stored in the memory for encrypting the original file by using the camouflaging file.

Abstract: A light assembly in the form of a net is provided which can be draped over a Christmas tree or other structures. The assembly includes a plurality of interconnected light bulbs seated within their respective sockets at the nodes formed by the interconnecting conductive, insulating wires which are energized by an electrical switch.

Abstract: A Christmas tree light assembly in the form of a net is provided which can be draped over the tree. The assembly includes a plurality of interconnected light bulbs seated within their respective sockets at the nodes formed by the interconnecting conductive, insulating wires which are energized by an electrical switch.

Abstract: The present disclosure is related to a combination lock with code thereof randomly variable, which is equipped with a pair of parallel rods disposed within an oblong casing; the upper actuation rod is provided with a number of spaced actuation claws with a corresponding number of dial wheels secured to the lower slide rod. Part of the dial wheels is exposed externally of the casing for easy dialing operation thereof.