ation ▁and ▁oper ates ▁as ▁a ▁ 5 0 1 ( c )( 6 ) ▁non pro fit ▁corpor ation . ▁Representatives ▁from ▁member ▁organizations ▁can ▁serve ▁on ▁the ▁Board ▁of ▁Direct ors ▁and ▁the ▁three ▁primary ▁working ▁groups : ▁technical , ▁cert ification , ▁and ▁market ing . ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : Comput er ▁printing ▁Category : Organ izations ▁established ▁in ▁ 2 0 1 3 ▁Category : Te chn ology ▁organizations <0x0A> </s> ▁A ▁London ▁Fl at ▁Myst ery ▁is ▁a ▁ 1 9 1 5 ▁British ▁silent ▁crime ▁film ▁directed ▁by ▁Walter ▁West ▁and ▁st arring ▁V era ▁Corn ish , ▁George ▁F ole y ▁and ▁Regin ald ▁Stevens . ▁It ▁is ▁also ▁known ▁by ▁the ▁alternative ▁title ▁The ▁Myst ery ▁of ▁a ▁London ▁Fl at . ▁The ▁screen play ▁concerns ▁a ▁Scotland ▁Y ard ▁detect ive ▁who ▁bel ieves ▁two ▁recent ▁mur ders ▁are ▁linked ▁and ▁sets ▁out ▁to ▁h unt ▁down ▁the ▁k iller . ▁ ▁Cast ▁ ▁V era ▁Corn ish ▁- ▁Margaret ▁For ster ▁ ▁George ▁F ole y ▁- ▁Bent ley ▁ ▁Regin ald ▁Stevens ▁- ▁ ▁Bob ▁P rit ch ard ▁ ▁Const ance ▁Back ner ▁- ▁Mrs ▁Ho oper ▁ ▁Richard ▁N orton ▁- ▁Bill ▁Ho oper ▁ ▁Andrew ▁Jackson ▁- ▁Leo ▁Scott ▁ ▁Hugh ▁Cro ise ▁- ▁Ins pect or ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : 1 9 1 5 ▁films ▁Category : 1 9 1 0 s ▁crime ▁films ▁Category : B rit ish ▁silent