av annes ▁valley ▁in ▁ 1 8 7 7 ▁and ▁then ▁to ▁Sol oth urn ▁in ▁ 1 9 0 8 . ▁ ▁In ▁ 1 9 1 5 ▁the ▁ ▁long ▁Gren chen berg ▁tunnel ▁connected ▁M out ier ▁and ▁Gren chen . ▁ ▁The ▁extensive ▁road ▁and ▁rail road ▁network ▁encourag ed ▁M out ier ▁to ▁industrial ize , ▁with ▁three ▁indust ries , ▁glass - making , ▁watch making ▁and ▁automatic ▁l ath es , ▁gain ing ▁international ▁recognition ▁for ▁M out ier . ▁ ▁In ▁ 1 8 4 2 ▁C él est in ▁Ch ât el ain ▁founded ▁the ▁Ver rer ie ▁de ▁M out ier ▁glass ▁factory . ▁ ▁They ▁became ▁the ▁most ▁important ▁window ▁glass ▁manufact urer ▁in ▁Switzerland ▁and ▁by ▁the ▁ 1 9 7 0 s ▁produced ▁ 2 5 0 ▁tons ▁of ▁glass ▁per ▁month ▁to ▁meet ▁Swiss ▁domestic ▁demand . ▁ ▁The ▁conversion ▁from ▁glass ▁rolling ▁to ▁float ▁glass ▁sp elled ▁the ▁end ▁of ▁the ▁old ▁M out ier ▁glass ▁factory , ▁it ▁closed ▁in ▁ 1 9 7 8 . ▁ ▁However , ▁a ▁subs idi ary , ▁Ver res ▁Indust ri els ▁SA , ▁had ▁been ▁created ▁in ▁ 1 9 5 5 ▁and ▁they ▁began ▁producing ▁glass ▁with ▁the ▁new ▁process . ▁ ▁Today ▁Ver res ▁Indust ri els ▁emp lo ys ▁about ▁ 2 0 0 ▁people . ▁ ▁Watch making ▁first ▁spread ▁throughout ▁the ▁J ura ▁region ▁as ▁a ▁c ott age ▁industry ▁during ▁the ▁ 1