Abstract: Disclosed is a tire marking system for marking tire identification information onto tires based on tire information in each of bar code labels adhered to the tires. The tire marking system includes a database server which includes a first database containing data of tire production plan information including tire quantity information and data of tire identification information, and a second database containing data for managing whether marking of the tire identification information is performed onto the tires. The tire marking system further includes client computers connected to the database server via communication media, and a image reading device and a tire marking device which are connected to each of the client computers. When the tire marking device completes the marking, in the second database of the database server, data of the marked tire identification information is updated to indicate that the marking is completed.

Abstract: A method of producing plastic pipe having air channels axially extending through the wall thereof, with at least one of the respective ends of the air channels being closed by an annular slotted channel-closure filled with a caulking material in its annular slot. The channel-closure is force-fitted on the pipe end, so that the caulking material is pressed into the air channels.