Any info on AKAI orthodynamic tweeter

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I just bought a pair of AKAI orthydynamic tweeters out of curiousity. The type number is 4IT-SM3G, and 8 ohms is maked on them. Diameter 40 mm, height 11 mm. It seems they have a ferrite disc magnet at the back (no holes) and another at the front (with 8 holes). The spiral on the aluminium (or plastic with aluminium layer) diaphragm is visible throgh the holes. There is a fine wire mesh at the front. I suppose they should be better than dome tweeters. Has anybody got any information on this speaker? Which AKAI loudspeaker box are they used?
 
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