| 摘要 |
A bar code able to measure distance or position having an encoded index point and additive and subtractive delineation bars to adjust the value of the index point. The numeric code has 10 characters in its set, each character having two dark bars in nine modules or a "Two of Nine Code". All bars or gaps of this code are a minimum of two modules in width. Each Numeric Digit may have and OCR (Optical Character Recognition) digit embedded into the barcode digit to make it human and machine readable. A bar code reader would read an index block and both an additive and a subtractive block. The value of the additive block is added and the subtractive block subtracted from the index block to give a true value of the position or distance.
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