Back in 1979 John Shingleton took an Olympus OM2 and rolls of “harsh and grainy” black and white film (remember film?) with him on a business trip to several small motor companies in Japan.
The factories were very noisy, hot, dirty and very crowded. They smelt of hot oil and hot metal. As you can see the working conditions were harsh. OH&S was not a consideration -note the lack of ear and eye protection. It would be so different today.I am sure much of the small engine production is now highly automated or has moved offshore most likely to China and other asian countries.