Synchronous communication can be built on top of asynchronous communication by using a Synchronizer. Vickers machine gun synchronized with the Sopwith-Kauper synchronizer. Examples of widely used asynchronous circuits include synchronizer flip-flops, switch debouncers and arbiters. Even then, at high engine revolutions Austrian synchronizer gears tended to behave very erratically. All versions of the AX15 feature brass synchronizer rings and require API GL-3 lubricant. The synchronizer output can be used to capture system time from a counter. This transmission utilizes bronze synchronizer collars resulting in sensitivity to lubricant make-up. They produced the world's first electronic clinical photic stimulator - the Schneider Brain Wave Synchronizer. The frame synchronizer recognizes this pattern and aligns the data into minor frames or sub-frames. A variation on the propeller synchronizer is the propeller synchrophaser. The frame synchronizer immediately follows the bit synchronizer in most telemetry applications. This gauge is also found installed with most propeller synchronizer and synchrophase systems. Carbon-coated synchronizer rings and hill-start assist were added to the manual transmission in 2014. All of the friction surfaces on the Synchronizer rings are sintered bronze. All of the friction surfaces on the synchronizer rings are sintered bronze.