[en] Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales $t_{\mathrm{E}}$ because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales ($t_{\mathrm{E}}\lesssim <!--\; ???\; -->6\mathrm{d}\mathrm{a}\mathrm{y}\mathrm{s}$) but also with very small angular Einstein radii (${\mathrm{\theta <!--\; ??\; -->}}_{\mathrm{E}}\lesssim <!--\; ???\; -->0.05\mathrm{m}\mathrm{a}\mathrm{s}$) among the events that have been found in the 2016–2019 observing seasons. These events include MOA-2017-BLG-147, MOA-2017-BLG-241, and MOA-2019-BLG-256, in which the first two events are produced by single lenses and the last event is produced by a binary lens. From the Monte Carlo simulations of Galactic events conducted with the combined $t_{\mathrm{E}}$ and ${\mathrm{\theta <!--\; ??\; -->}}_{\mathrm{E}}$ constraint, it is estimated that the lens masses of the individual events are ${0.051}_{-<!--\; ???\; -->0.027}^{+0.100}{M}_{\odot <!--\; ???\; -->}$, ${0.044}_{-<!--\; ???\; -->0.023}^{+0.090}{M}_{\odot <!--\; ???\; -->}$, and ${0.046}_{-<!--\; ???\; -->0.023}^{+0.067}{M}_{\odot <!--\; ???\; -->}/{0.038}_{-<!--\; ???\; -->0.019}^{+0.056}{M}_{\odot <!--\; ???\; -->}$ and the probability of the lens mass smaller than the lower limit of stars is ∼80% for all events. We point out that routine lens mass measurements of short-timescale lensing events require survey-mode space-based observations.