其构成是塑料空心砖的平面、侧面设有密封槽、密封条、通孔，一次压制成型。
The flat face and the side face of the plastic hollow brick are provided with a sealing groove, a sealing strip and through holes; the plastic hollow brick can be formed once by pressing.
气门头可通过一次压制和烧结、两次压制和烧结、锻造和机加工、锻造和烧结及动磁压制成形和烧结而制成。
The valve head may be made by single press and sintering, double press and sintering, forging and machining, forging and sintering, and dynamic magnetic compaction and sintering.
1906年，它们可以在有排孔的传送带上被压制生产，一次十二个，此后它变得更便宜。
It became cheaper still when, after 1906, they could be extruded by perforated conveyor belts a dozen at a time.
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