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Arcsecond scale radio polarization of BL Lacertae objects

We present deep VLA radio observations of six sources from the 1 Jy sample (Stickel et al. 1991) of radio se- lected BL Lac objects (RBL). The polarization properties of the extended emission of these objects are not consistent with those of the FR I radio galaxies (Fanaroff & Riley 1974) usually indicated as their \misaligned population".