He and I worked on it for several years, but it was the 1970s, and the technology that was available to amateurs just wasn't there yet.
여러 해 동안 아버지와 저는 이 일에 몰두했습니다. 하지만 1970년대에 우리 같은 아마추어들이 가지고 있는 기술이란 보잘 것 없었지요.