I have a `data.frame` like this:

```
DeviceName                SessionLength
samsung SM-A500FU         6168
samsung SM-N9005          16199
iPad3,3                   5447
Sony C6602                13838
Iriver tolino tab 7       13657
iPhone6,2                 13434
samsung SAMSUNG-SGH-I317  13292
...

```

I need to sort this table to see `DeviceName` that have all `SessionLengths < 200`. Any ideas?