410 IAC 5-6.1-92
410 IAC 5-6.1-92 "Shutter" defined
Cite as Ind. Admin. Code tit. 410, r. 5-6.1-92
Sec. 92. As used in this rule, "shutter" means a device attached to the tube housing assembly which can totally intercept the useful beam
and which has a lead equivalency not less than that of the tube housing assembly.