-let known version = StringMap.mem version map;;
-let size version = let (_, size) = StringMap.find version map in size;;
-let of_bits version bits =
+let net_device_known version = StringMap.mem version map;;
+let net_device_size version =
+ let (_, size) = StringMap.find version map in size;;
+let net_device_of_bits version bits =