This Day in Auto History:

4.30.1910 H. Kerr Thomas begins designing the Pierce-Arrow 5-ton truck 4.30.1921 The Miller 183 8-cylinder engine makes its racing debut in a 150-mile race in Fresno, CA 4.30.1948 The Land Rover is introduced at the Amsterdam Auto Show 4.30.1962 The 47,000,000th Chevrolet is produced 4.30.1978 The Mercedes-Benz C-111/3 research car sets nine world records for Diesel-engined cars, including 2,345 miles in 12 hours (an average of 195.39 mph)

Source: Automobile History Day By Day, by Douglas A. Wick