The Superplex universal daylight developing tank appeared in the New Goods section of BJPA in 1936 and again in the advertisement (alongside its 35 mm equivelent, the Superkino) from the British agents, The Norse Trading Co:



Clearly, there was a marketing push in Britain in the late 1930s for these tanks made by Fischer. However, I suspect the efforts were not that successful since these tanks do not make a regular appearance on eBay.

The Norse Trading Co (London) Ltd, incidentally, was struck off the register of companies in 1958.