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R& (2 manufacturers)

R (28 manufacturers)

R. (4 manufacturers)

R/ (1 manufacturers)

R4 (1 manufacturers)

RA (568 manufacturers)

RB (2 manufacturers)

RC (5 manufacturers)

RD (3 manufacturers)

RE (593 manufacturers)

RF (4 manufacturers)

RG (2 manufacturers)

RH (62 manufacturers)

RI (574 manufacturers)

RJ (1 manufacturers)

RL (2 manufacturers)

RM (1 manufacturers)

RN (1 manufacturers)

RO (1367 manufacturers)

RP (1 manufacturers)

RR (2 manufacturers)

RU (317 manufacturers)

RV (17 manufacturers)

RY (65 manufacturers)