Transcription:
Hultgren Axel [Gustaf Emanuel
Teknol
Bergsbr.
The fatique praperties impact resistance and
hardness of some mickel- chromiui gear
ateels case-hardened oil- hardened and
aer-hardened respectively.
8:o Stockholm 1927
Se: Ingeniorsvetenskopsakadenien. Handlingar.
59.) vexnol.
Mnst.
Sthm.]