suchen [und] SGB RO 52-550[0123456789]* or RO 52-55[123456789][0123456789]* or RO 52-5[6789][0123456789][0123456789]* or RO 52-6[0123456789][0123456789][0123456789]* or RO 52-7[0123][0123456789][0123456789]* or RO 52-74[012345678][0123456789]* or RO 52-749[0123456789]*