surface of said tag, said timing marks being equal 'in nilmber to the number of said information mark ': positions and arranged in a circular pattern con• centric with said information mark pattern for synchronously generating timing signals during the 5 scanning of said information positions, a Start mark imprinted on and optically contrasting with said print receptive surface of said tag, said start mark being offset from the center of said concentric circular patterns, and 10 an aligner located at the center of said patterns, said '-' aligner being engageable with said probe for aligning ; said concentric circular reader scanning paths with said respective concentric circular timing and information patterns and start mark, thereby facilitating 15 fag reading of said marks by said phototransducers. 2. The tag of claim 1 further comprising a second plurality of information mark positions located on said print receptive surface of said tag, said second plurality of information mark positions being adapted to receive en- 20 coded photosensible information marks, being arranged
in a circular pattern concentric with said timing mark and first information mark patterns, and being aligned with one of said circular scanning paths for reading.by one of said photo-transducers.
3. The tag of claim 1 wherein said start mark is aligned with one of said timing marks for establishing in combination therewith a unique angular reference position relative to said concentric patterns of marks for separating the beginning and end of a circular encoded information pattern.
4. The tag of claim 1 wherein said aligner is a through hole.
5. The tag of claim 3 wherein said aligner is a through hole and further including a plurality of humanly intelligible character positions located without said circular patterns and adapted to receive a humanly intelligible translation of encoded information without obscuring said photosensible information, timing, and start marks.
No references cited. DARYL W. COOK, Primary Examiner.