The High Speed Gear Box, High Efficiency, is perfect for high speed applications. Two gear ratios are possible, and several styles of crank arms are
High Speed Spur Gearboxes Inline Spur Gear Reducers
High Torque Right Angle Gearbox - Graessner USA
NGC's High-speed Box for Hydrogen Expanders is Identified as the First Major Equipment in Jiangsu Province - China Transmission - Geared for a Better Future
Tamiya 72002 High-Speed Gearbox Kit - gear with a DC motor - Kamami on-line store
Technicraft : ModelKits123
SHS AEG Gear Set (High Speed) for Version 2 & Version 3 Gearbox (16:1)
Tamiya High Speed Gear Box H.E. ITEM 72002 Believed Complete, Box Okay Condition
タミヤ テクニクラフトシリーズ No.3ハイパワーギヤーボックス HE - 模型製作用品
Technicraft : ModelKits123