N-23

Citation:

N-23. Norrbottens Järnverk, A. B., “Manufacturing a hardened steel article,” Great Britain Patent, GB1490535, 1977. 

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  1. PHS Automotive Applications and Usage - AHSS Guidelines - […] as Norrbotten Iron Works). The first patent application was completed in 1973, and awarded in 1977.N-23  In 1975, a…

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