Dear Kira, I sent You whole page about Benjamine from 'All Moscow-1911' by e-mail yesterday, but, if you want I can attach the same information about Benjamine from 1911 one else. Also (I think you cannt read in Russian, isn't it?) I can translate that data into English.
'Potemkine Benjamine Alexandrovich, Sredny (Middle) Kislovsky per. (small street) 15, Fedorov's B&B house, apt. 1. the assistant of barrister'