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Folding telescope designed by Horace Dall

Folding telescope designed by Horace Dall

1960-1975
Folding telescope designed by Horace Dall

Folding telescope designed by Horace Dall

1960-1975
Dall-Kirkham Cassegrain reflecting telescope of folding design, aperture 6 inches

Folding telescope designed by Horace Dall

1960-1975