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Is it still useful now? Now there are titanium-magnesium alloys.
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The equipment is not expensive, tens of thousands of dollars can be produced.
About 100,000-200,000 It mainly depends on what grade of interior door you want to operate. >>>More
Basically, it's all woodworking tools.
Saws: Cutting materials should be cut with a table saw, some places need a circular saw held by hand, cutting large arcs can be used with a band saw machine, fine places should use a wire saw machine, and a few jigsaws can also be used as a supplement. >>>More
Installation tools: electric hammers, carpentry hammers, planers, flat files, fine pitches, screwdrivers, angle rulers, tape measures, hanging hammers, levels, drills, hole openers, special sturdy connectors, etc. >>>More
Installation tools: corner cutting machine, air pump, straight nail gun, etc. >>>More
Oven (drying wood), laminating machine, engraving machine, air pump, etc.