Exosat Flight Spare Medium-energy Proportional Counter, English, 1981-83 (proportional counter; medium-energy proportional counter)
Exosat Flight Spare, Gas Scintillation Proportional Counter, England, 1981-83 (gas scintillation proportional counter)
Gold-plated grazing - incidence paraboloidal mirror for X-ray astronomy (ancillary instruments; concave mirrors; components; astronomical instruments)