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Amazon.com : Manfrotto 131DDB Horizontal 4 Head Accessory Arm - Black (for Mounting 2 Heads Vertically and 2 Heads Horizontally, 3/8" Thread On All Attachments) : Electronics
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Manfrotto 131DB 23.6" Reproduction Arm with Double Camera Attachment Black : Tripod Accessories : Electronics - Amazon.com
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