Assertion: warhead's range | /r/HasProperty | developed
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Source sentences:
text: A range of Novichok agents were developed and tested in the 1970s and 1980s, but the intended Novichok weapons production site at the Pavlodar Chemical Plant in Soviet Kazakhstan was still under construction when it was decided to demolish the chemical weapons building in 1987 in view of the forthcoming Chemical Weapons Convention.