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Shevet HaLevi on When We Answer What During Prayer (8 Iyar)

שו"ת שבט הלוי חלק ג:טו   8 Iyyar, 5734 (1974)

During Shemoneh Esrei, if you hear someone making a bracha, birchat kohanim, or the chazzan is finishing kedusha, do we answer?