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David Sarnoff Gallery: 1910-1919
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| Armstrong_Regen_1-14 | Armstrong_Regen_1-14-2 | Armstrong_Regen_1-14-3 | Armstrong_Regen_1-14-4 |
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| Radio_1914-1 | Radio_1914-2 | Radio_1914-3 | Radio_1914-4 |
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