重厚じゅうこう長大ちょうだい産業さんぎょうだったら
jūkōchōdaisangyōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 重厚長大産業

1. If it were a heavy/substantial/large-scale industry; If it were a major industry

Tara Conditional