alleryGreen porcelain enamel was first used for boards in which year?
A1830
B1950
C1930
D2000
Answer & Solution
Correct answer: C. 1930
1. Slate boards were manufactured from the 1840s.
2. Green porcelain enamel was first used in 1930.
3. Green boards became common in US schools in the 1950s, not first used then.
_Source: Wikipedia, Blackboard, Etymology and history_
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