The Maruso Patent Box is a metal box camera, reportedly taking 24×35mm vertical pictures. The film is loaded through the removable rear panel. It is said that the camera contains a metal insert with the spool holders and exposure frame. There is a metal handle at the top, also used as a frame finder and back latch. The advance knob is on the photographer's right, and has a manual exposure counter at the base. There is no red window in the back.
The lens has a fixed focus and aperture. The everset shutter is tripped by a lever on the right, and reportedly has B and 1/25 settings. The markings on the shutter plate are hardly legible on the only picture known so far; they reportedly state that the camera was made in Occupied Japan.
- Takesaki Harutoshi (竹崎春年). "Boruta-han kamera no subete [katarogu]" (ボルタ判カメラのすべて[カタログ], All Bolta-size cameras [catalogue]). In Kamera Rebyū: Kurashikku Kamera Senka (カメラレビュー クラシックカメラ専科) / Camera Review: All about Historical Cameras no.21, June 1992. No ISBN number. Kurashikku kamera daikenkyū (クラシックカメラ大研究, studies on classic cameras). Pp.95–105.