I remember two 'suits' from upstairs standing behind me occasionally doing time studies.
They actually held clipboards and stopwatches to measure how long it took for me to attach various parts.
These are marked with EIA code “606” which is the company number for Schumacher.
Well, this universal “truth” was debunked when we found a bunch of amps with transformers made by the Better Coil and Transformers company.
Not only that, but to meet Swedish safety codes, Hagstrm removed the external voltage selector switch (fitted to all blackface and silverface export models) and hardwired it internally (see photos).