Manually operated photocomposition systems using fonts on filmstrips allowed fine kerning between letters without the physical effort of manual typesetting .
Manually operated photocomposition systems using fonts on filmstrips spawned an enlarged type design industry in the 1960s and 1970s .
Manually operated photocomposition systems using fonts on filmstrips allowed fine kerning between letters without the physical effort of manual typesetting , and spawned an enlarged type design industry in the 1960s and 1970s .