BUR #32887 has been approved by @nonamethanks.
create implication walkman_b_series -> digital_walkman
create implication walkman_e_series -> digital_walkman
create implication walkman_nw-s203f -> digital_walkman
Can do this finally. B and E series designs have consistent enough shared traits that grouping them makes sense similar to the iPod variants, whereas the S203F is an outlier in its series.