Luftfahrtvereinigung Greven von 1931 and Luftfahrtvereinigung Greven e.V. are the same. The current official naming is Luftfahrtvereinigung Greven e.V. (older long version: Luftfahrtvereinigung Greven von 1931 e.V.)
They are operating the following airframes:
D-EDDG
D-ESEF
D-EJAN
D-KYGI
D-EGMS is not longer operated by LFV Greven
Ultralights:
D-MHLG
D-MHLA
former airframes: D-MCOH, D-MBLG
Sail:
D-5439
D-2342
D-0117
D-4558
D-5306
D-1206
D-2124
Duo Discus (unknow reg)
former airframes: D-3384, D-2636, D-6093, D-7908
Ingo