Rule 133 — Numbering

Except where numbering is controlled by computer, each RTC desk in a multiple desk office and desks controlling adjacent territories will use a separate series from other desks for numbering a GBO , clearance, TOP , authority, instruction or other information which requires numbering. Unless otherwise provided each series must be numbered consecutively using whole numbers. All numbers in a series may be preceded or followed by a letter(s). Duplicate numbers must not be in effect at the same time.