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The 7th digit is the year of manufacture. "4" would mean 2004. The 8th, 9th and 10 digits indicate the julian day on which the unit was manufactured in that year. Julian days are the numerical day of the year and run from 1 thru 365 (or 366 in leap years). If the number was 031, that would mean Jan 31. If the number was 053, that would mean Feb 22, and so on.The 7th digit is the year of manufacture. "4" would mean 2004. The 8th, 9th and 10 digits indicate the Julian day on which the unit was manufactured in that year. Julian days are the numerical day of the year and run from 1 through 365 (or 366 in leap years). If the number was 031, that would mean Jan 31. If the number was 053, that would mean Feb 22, and so on. === 4DTV Equipment Checklist === * DSR-922 with a VCRS module* HD-220 HD Decoder* 8' Solid or 10' Mesh minimum dish size