1. Check the receipt of the advance payment (the advance payment has been made) and the final payment<br>2. Volume quotes have been sent to customers<br>3. After the last visit your company asked customers about the use of: DFB devices are very sensitive to current, in the same current, compared to other manufacturers of lasers have better scanning bandwidth, feedback problems, in communication<br><br>4. Communicate with customers to get a follow-up contract
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