Though the RB67 is a completely mechanical camera there are a variety of motorized film backs and automatic exposure finders that do require batteries.

[3]: 168 Mamiya began producing folding cameras for 120 medium format film in 1940 during World War II.

In 1957 they introduced the Mamiyaflex C which incorporated several common features from large format press cameras: a bellows focussing system, and interchangeable lenses.

[7]: 154  Despite their initial popularity with the press photographers, by the late 1960s other manufacturers were successfully producing and marketing medium format SLRs with interchangeable film backs, allowing a photographer to change film stocks without changing camera bodies.

[3]: 317  Polaroid exchangeable backs allowed instant photography with many professional cameras including the RB67.