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1890年英国生产的双镜头旅行相机。这种相机可以同时为一个景物拍摄两张照片,当时称作立体照片,其实这类相机
1890 British production of dual-lens travel cameras. This camera can take two photos for a scene at the same time. At the time it was called a stereoscopic photo. In fact, this kind of camera