CovariantReturn.cs

using System;

namespace DotnetCommunityDemoNet5
{
    abstract class Component:ICloneable
    {
        public int ComponentId { get; }

        protected Component(int componentId) => ComponentId = componentId;

        public abstract object Clone();
    }

    class Calculator : Component
    {
        public float Factor{ get; }

        public Calculator(int componentId, float factor) : base(componentId) => Factor = factor;

        //type known on call site!!! 
        public override Calculator Clone() => new Calculator(ComponentId, Factor);
    }
}