Considered the longest continuous production in film's history, 12 is also the first film to use the aging of its actors as a practical effect.

The longer production was stalled, the larger the bubble in the pipeline.

It was a large, long and difficult production, filmed on location in the Sierra Nevada.

The film had a very long and troubled production.

What was the biggest change she had noticed throughout the long production?

Thereafter the M7 class had a long production run with five major sets of design variants.

Flight trials were successful, leading to a long production run with six variants, which introduced various modifications.

Many companies now offer both long and short productions.

During its remarkably long production run it underwent only minor modifications.

However during its long production in South Africa it has been available with the following engines: