Abstract: A system of attachment surface structures that find their best use in the form of repeatedly removable straps and bands for securing one object to another. The surfaces are preferably constructed of narrow sheets of flexible polymer plastic materials having generally high tensile strength. A first embodiment includes shaped parallel ridges on one surface that interlock with mating parallel ridges on an opposing surface. These parallel ridges may be double sided (interlocking on both sides of each shaped ridge with the next shaped ridge on either side) or single sided (interlocking with a single ridge oriented 180 degrees from the first). Further embodiments include an array of shaped posts of various regular geometric shapes that interlock with an opposing array of similar or distinct posts.

Abstract: An electronic bingo game is disclosed in which a memory is provided for storing all of the numbers called in a last set until the current set is completed and the next set begun. A claim to a late bingo game can then be easily verified by recalling the numbers from the last set. A preselectable time interval is provided to determine the rate at which the bingo numbers are called. A true random number selection process is provided to select the bingo numbers called. A randomly selected seed number is provided at the start of each set, and the seed number used in each random selection for that set. Additional memory is included for storing the game patterns that will be used in each set, and each pattern will automatically be called up and displayed to the players as each new set is begun.