Question: Who developed a device that improved on the shortcomings of Scheiner's invention?

Is "The system was later extended to cover larger ranges and some of its practical shortcomings were addressed by the Austrian scientist Josef Maria Eder (18551944) and Flemish-born botanist Walter Hecht (de) (18961960), (who, in 1919/1920, jointly developed their EderHecht neutral wedge sensitometer measuring emulsion speeds in EderHecht grades)." the correct answer?
OPTIONS:
(A). yes;
(B). no;
(A).