鉛板 is read as えんばん (emban) and means lead plate.
えんばん
emban
あえんばん
zinc plate
あえんてっぱん
galvanized sheet iron
あえんめっきこうばん
えんぴつ
pencil
なまり
lead (Pb)
えんちょくめん
vertical plane
なまりこうがい
lead pollution
えんちょくせん
vertical line
えんしつほう
lead chamber process
こうばん
steel sheet
かんぱん
deck (of a ship)
かんばん
closing (for the day, esp. of a restaurant or bar)