Bug Zappers?
I always thought the sound of bug zappers was pleasant background when eating outdoors. Now you can get battery operated ultrasonic bug repellent at many places. Over 2,000,000 response on Google. Put it in the middle of your dining table. I wouldn't be surprised if some restaurants offer this. Of course Citronella candles and the like are still around as ell as the traditional repellent lotions.
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