(formal) dear sirs, Messrs. (form of address used in formal letters, placed after the name of the organization to address members of that organization)

三菱: Mitsubishi

Mitsubishi (industrial company)

隠密: Stealthy, covert, undercover.

隠密: Stealth; a spy or undercover detective.

Short for 重工業 (jūkōgyō, “heavy industry”).

(phonetics) nasal consonant

(historical) a kind of hairstyle worn by women of the nobility in the late Edo period as a simplification of the 大垂髪 (ōsuberakashi) style, with no 簪 (kanzashi, “ornamental hairpin”) or other adornment, and with the long hair of an additional hairpiece allowed to hang loose in back

Alternative spelling of お腹: belly, tummy, stomach, abdomen / cotton batting (from the way that batting was used in the 中 (naka, “inside”) of cushions and quilts)

喉内音: dorsal consonant in Sanskrit phonology