Abstract: A method of impressing a secret pattern on a substrate by the use of an uninked intaglio printing plate having the foreground area with a pattern of ridges and grooves which are distinctively different from the ridges and grooves in a background area enclosing the foreground area. The secret pattern may be observed only a person who is informed as to what pattern he is looking for and how to look at that pattern. Particularly, his line of sight must make a certain angle with the plane of the impressed substrate. The line of sight must also be oriented properly with respect to the background and foreground areas.

Abstract: A machine for applying tax stamps or like adhesive labels to articles such as cigarette packages arranged in two or more rows in a carton, including mechanism for advancing the carton lengthwise with exposed ends of the packages facing upwardly, and a head disposed above the path of carton advance for transporting a corresponding number of rows of spaced-apart labels into contact with the advancing package ends while the labels and packages are moving in the same direction and at the same velocity.

Abstract: A web of adhesive labels for use with a machine for applying tax stamps or like adhesive labels to articles such as cigarette packages arranged in two or more rows in a carton, including mechanism for advancing the carton lengthwise with exposed ends of the packages facing upwardly, and a head disposed above the path of carton advance for transporting a corresponding number of rows of spaced-apart labels into contact with the advancing package ends while the labels and packages are moving in the same direction and at the same velocity.