You will find many symbols and letters on the inside of parts.
These marks were applied during production and were part of keeping track of machining steps and quality assurance work.
Workers were paid per correctly executed production step. So it was necessary to check a workers work and mark it before it was passed to the next station. If workers messed up, they did not get paid for the part. At the same time, when a worker performed his work on a previously unaccepted part, he would also receive no pay for his work.
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