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Telescope lens made by Ronald Nicholas Irving

Telescope tube made by Ronald Nicholas Irving

Telescope mirror made by Ronald Nicholas Irving

Box of lenses for telescopes made by Ronald Nicholas Irving

Mould for suppliers to cast parts

Mould for suppliers to cast parts

Mould for suppliers to cast parts

Tripod for telescope made by Ronald Nicholas Irving

Tokens used for branding equipment 'H.N.Irving'

Three moulds for suppliers to cast parts