Since its development and use during World War II, there have been notable advancements in the technology and concept of proximity fuses. While I cannot speak to any classified or proprietary developments, here are a few examples of public knowledge advancements:

1. Miniaturization: One significant advancement in proximity fuse technology is miniaturization. Modern proximity fuses can be made much smaller and lighter than the earlier versions, allowing them to be used in a wider range of applications, such as missiles, artillery shells, and other precision-guided munitions.

2. Radar-guided fuses: In some cases, proximity fuses can use radar technology to detect the target and adjust the detonation time. This can help improve accuracy and reduce the risk of the fuse being fooled by countermeasures.

3. Electronic fuses: Some modern proximity fuses use electronic sensors and microprocessors to detect the target and adjust the detonation time. This can help improve accuracy and reduce the risk of premature detonation or misfires.

4. Improved range and accuracy: Modern proximity fuses can be programmed to adjust the detonation distance based on the speed and altitude of the target, allowing for greater range and accuracy.

Overall, advancements in proximity fuse technology have helped improve the accuracy and effectiveness of a wide range of weapon systems, from anti-aircraft guns to precision-guided munitions.
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