public Gsm(string model, string manufacturer, float price, string owner,
Batterys battery, Displays display)
: this(model, manufacturer, battery)
{
this.Price = price;
this.Owner = owner;
this.Display = display;
}
public Gsm(string model, string manufacturer, float price, Batterys battery, Displays display)
: this(model, manufacturer, price, null, battery, display)
{
}
