With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Wilson Greatbatch developed the lithium iodide cell .
text_B: In the late 1960s , several companies , including ARCO in the USA , developed isotope-powered pacemakers , but this development was overtaken by the development in 1971 of the lithium iodide cell by Muffy Vestal .
REFUTES.