Mokshan logographic script?

have you heard about the Mokshan logographic script? [Moksha is a language of the Mordvinic branch of the Finno-Ugric languages.]
i have found some information on Wikipedia, but not elsewhere, so i'm not sure if it really was a fully developed writing system... maybe it was just a set of tamgas? anyway, it seems very interesting. the Wikipedia article has two examples of this script:



[x-posted to LΦ, F-U & my LJ]