I’m sorry to be late… tico seems to be right.
The Blitz were marketed by CASSIN (Italia) and created by Martin Gutsche in 1987 .
Some more info: Patent DE 37 17 027. 8 December 1988. In the Cassin catalog 1991, the Blitz are numbered as #1, #2 and #3. Lighter than a SLCD of a similar size. The color anodized part must be placed upside, the non anodized part being downside.
Steve, your prototypes with coil springs are superb!
The small one on the left is as it would be situated in a crack. When loaded, the hitched sling draws the mobile ends toward each other and the scissor action provides the holding power.
The design flaw in a parallel placement is that the load transfer in a shock loading situation is too quick to allow the mechanism to bite and maintain its position. Loading in a conventional cam is prompt and direct.