Gallium phosphide crystallites grown from a gallium melt, as used as a basis for crystal lamps, part of early light emitting diodes, manufactured at Services Electronics Research Laboratory, England, 1960-1970 Gallium phosphide crystallites grown from a gallium melt 1960-1969
Projector-type binnacle and magnetic compass with two correcting spheres on a wooden base, by Kelvin Hughes Limited, British, 1950-1955 Projector-type binnacle and magnetic compass with two correcting spheres on a wooden base 1950-1955
