File:Double arm, Type 4 barn-door drive for astrophotography.jpg
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![File:Double arm, Type 4 barn-door drive for astrophotography.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Double_arm%2C_Type_4_barn-door_drive_for_astrophotography.jpg/800px-Double_arm%2C_Type_4_barn-door_drive_for_astrophotography.jpg?20180131050935)
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