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Transmigrated as a Stepmother: Time to Bring the Family to Prosper! - Chapter 241 - 240: Marketing Tactics
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Chapter 242 - 241: Damn Spoiling
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... every household has.
Normal door hinges are large, with two grooves on the top and bottom, with a round wooden piece in between, which holds the wooden door; when fitted into the grooves, it allows the door to open and close smoothly.
However, as it’s not very smooth and has high friction, it often makes a "creak, creak" noise when opened or closed.
This design, when scaled down, can be applied to pencil cases, and the noise is also significantly reduced.
Liu the ...
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