1964 Accutron Astronaut Ad - "For 300 years, the most precise time was kept by a balance wheel. Accutron ended that era."
1964 Accutron Astronaut Ad - "For 300 years, the most precise time was kept by a balance wheel. Accutron ended that era."

1964 Accutron Astronaut Ad - "For 300 years, the most precise time was kept by a balance wheel. Accutron ended that era."