They are resin casted clones for the combination gears for the range and peak deviation module of the HP 8640b signal generator. They are NOT original spares intended as a replacement of HP part/no
1430-0773 and 1430-0774. They have been manufactured by myself as I personally own an 8640b generator that needed a full combination gear replacement. They are NOT a perfect clone because of the homemade/craft casting process, but they actually work fine as can be seen @
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Hope this can help!
-Emanuele.