A close alliance with the shogunate during the Edo period led to orders being placed and workers being alternately seconded to Edo where they carried out firearm maintenance at Edo-jo Castle.
江戸時代には幕府と密接に連携し一定量の発注を受けて生産し、工人等は交代で江戸に詰め、江戸城での銃器メンテナンスも行った。