Andy, there's quite a few of them from different companies all over the popular cycling routes in the Alpes. I'm not quite sure where you were when you saw them but if it was anywhere near the Galibi-er or the Alpe D'Huez area then google Photo Breton and Griffe Photo. They're the two main snapping businesses for that area.
Sorry about the spelling mistake for Gali  but if I spell it correctly the last part auto changes to the smilie !
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