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Four slide holders

Four slide holders

Rotating slide holder with paper picture held in place by spring

Rotating slide holder with paper picture held in place by spring

Sharp-Crawford rotary device, a type of rotating slide holder

Sharp-Crawford rotary device

Sharp-Crawford rotary device, a type of rotating slide holder

Sharp-Crawford rotary device

Slide holder for circular slides, able to rotate about central axis, fits usual slide holder

Slide holder for circular slides