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30-inch Dobsonian telescope for the Swiss Alps - 30 inch Zerodur mirror
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30-inch Dobsonian telescope for the Swiss Alps - 30 inch Zerodur mirror
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Making two matching 30 inch [0.76m] F2.7 telescope mirrors and one telescope
Making two matching 30 inch [0.76m] F2.7 telescope mirrors and one telescope
Dr. Erhard Hänssgen's 42 inch (107 cm) Dobsonian Telescope