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typology and history | ||
phonograph cylinders | |||
shellac discs | |||
instantaneous discs | |||
microgroove discs | |||
synopsis | |||
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causes of deterioration | ||
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preventive measures | ||
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standards | ||
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bibliography |
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typology and history | ||
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causes of deterioration | ||
humidity and temperature | |||
mechanical deformation | |||
dust and dirt | |||
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preventive measures | ||
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standards | ||
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bibliography |