public GSM(string model, string manufacturer, decimal? price, string owner, Battery battery, Display display)
{
this.Model = model;
this.Manufacturer = manufacturer;
this.Price = price;
this.Owner = owner;
this.GsmBattery = battery;
this.GsmDisplay = display;
}
public GSM(string model, string manufacturer, decimal? price, string owner)
{
this.Model = model;
this.Manufacturer = manufacturer;
this.Price = price;
this.Owner = owner;
this.GSMBattery = new Battery();
this.GSMDisplay = new Display();
}