Answer :
Final answer:
The main difference between the FMU-139 A/B and FMU-139 B/B fuzes lies in their technological features and improvements, with the latter providing enhanced reliability, safety, flexibility, and cost-efficiency.
Explanation:
The FMU-139 A/B and FMU-139 B/B are both types of electronic fuze used in military weaponry, specifically in air-dropped munitions. The main difference between them lies in their functionality and technology. The FMU-139 A/B, being the older model, utilizes a conventional electrical system for detonation while the FMU-139 B/B, as an upgraded variant, introduces a more advanced microcontroller-based electronics system providing enhanced reliability, safety, and flexibility.
Most notably, the latter is more cost efficient due to the reduction of required legacy components. These advancements allow for better control over the detonation timing and improved overall performance in the field.
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