/*------------------------------ Maker Code ------------------------------*/

function MakerCode(code, maker) {
	this.code=code;
	this.maker=maker;
	return this;
}
/*------------------------------ Car Code ------------------------------*/

function CarCode(code, model) {
	this.code=code;
	this.model=model;
	return this;
}

/*------------------------------ Grade Code ------------------------------*/

function GradeCode(code, grade) {
	this.code=code;
	this.grade=grade;
	return this;
}