made in..., manufacture
製 centers on making goods through a systematic process: manufacturing or producing something, often with the sense of being 'made in' a particular place.
製 combines 制 (regulate, control) with 衣 (clothing), originally referring to cutting and making clothes according to a pattern. The meaning broadened to manufacturing in general.
The top part 制 suggests regulation or control, and the bottom 衣 is clothing. Imagine a factory where clothing is systematically cut and sewn according to strict patterns: that is manufacturing.
For セイ, picture a factory assembly line where workers say 'say' as they pass each piece: 'say' -> セイ, and the whole process is manufacturing.
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make; manufacture; -made; made of ...; made in ...
manufactured goods; finished goods; product
manufacture; production
manufacture; production
reproduction; duplication; reprinting
medicine manufacture; drug manufacture
special make; deluxe
wooden; made of wood
refining; purification
manufacturing method; recipe; formula
dairy products
manufacture; production
handmade; homemade
iron manufacture
sewing (by machine)
drafting; drawing
made of iron
ready-made; off the shelf
papermaking; paper manufacture
sugar manufacture
steel manufacture
new product
ready-made clothes; ready-to-wear clothes; off-the-rack clothes; off-the-peg clothes
made in Japan; Japanese-made