Time-evolution of the Doppler velocity measured from the minimum of the He Iλ5876 feature. Each object is plotted with a unique combination of symbol and color where the color indicate subtype, with SN Ib plotted in blue and SN Ib in green. The three SN Ib plotted with filled symbols are SNe 2005bf, 2007Y, and 2007kj, and are identified as ‘flat-velocity’ SNe IIb by Folatelli et al. (2014), while others have referred to such objects as transitional SNe Ib/c (e.g., Hamuy et al. 2002; Stritzinger et al. 2009). Using classification criteria based on the pEW of Features 4 and 5 as discussed in this paper these objects are consistent with a Type Ib classification (see also Liu et al. 2016 and Prentice & Mazzali 2017 for additional discussion).