The choice of the large 9 x 12 for­mat was notable, as the pre­ced­ing decades had seen a trend towards small­er for­mats such as 45 x 107 and 6 x 13. The Indu­por sys­tem achieved mixed suc­cess. The stereo cam­eras are rare today, which indi­cates lim­it­ed com­mer­cial suc­cess. The fold­ing stere­o­scope, how­ev­er, was high­ly suc­cess­ful. The view­er was pro­duced on a large scale, and many rebrand­ed, and pos­si­bly imi­tat­ed, ver­sions are known. The front pan­el of the view­er was used in the company’s logo.

(from: Com­pendi­um of Stereoscopes)