Digital Equipment Corporation | postage stamp | Original equipment manufacturer | Terence Stamp | Stamp Act | Postage stamp | Associated Equipment Company | Personal protective equipment | Rachel Stamp | Stamp Act 1765 | Personal protective equipment (PPE) | definitive stamp | Christmas stamp | British Army uniform and equipment in World War I | Spalding (sports equipment) | Semiconductor Equipment and Materials International | Herb (from Basic Equipment) | Gibbons Stamp Monthly | Clark Equipment Company | White Farm Equipment | Submarine Escape Immersion Equipment | Stamp collecting | stamp collecting | Stamp Act Congress | Postage stamp booklet | original equipment manufacturer | Linn's Stamp News | Gavin Stamp | Definitive stamp | Data circuit-terminating equipment |
Imperforate stamps have been issued occasionally since then, either because separation equipment was temporarily unavailable (in newborn nations for instance), to makers of automatic stamp vending equipment (the United States did this in the 1900s and 1910s), as novelties for stamp collectors (particularly when stamps are issued in souvenir sheets), or as errors.