4810.31.30.00 - Cards, not punched, for punchcard machines, whether or not in strips

This HTS category, 4810.31.30.00, specifically classifies cards designed for punchcard machines that are not perforated. These cards are typically made of paper or paperboard, as indicated by the parent categories, and are intended for use in data processing or automated systems where physical cards with pre-punched holes would have been the primary medium. The defining characteristic is their function as input or storage media for mechanical or early electronic data processing equipment, even if they are supplied in strips rather than individual cards.

Distinguishing this category from its sibling, 4810.31.65.00 "Other," is crucial. While both fall under the broader umbrella of kraft paper and paperboard meeting specific weight and bleaching criteria, this specific subheading is for cards *intended for punchcard machines*. The sibling "Other" category would encompass kraft paper products meeting all the preceding criteria but not specifically designed or manufactured for punchcard machine applications. Therefore, the intended use and form factor are the key differentiators.

As this subheading represents a leaf node in the HTS classification, there are no further subcategories. Classification at this level is determined by the presence of the kraft paper/paperboard characteristics and the specific function as cards for punchcard machines. If a product meets all the preceding technical specifications (kraft paper, bleached, wood fiber content, weight) and is clearly manufactured or presented for use in punchcard systems, it will be classified here.