Treatment of materials by means of an ammonia based gas mixture; Treatment of materials in the nature of providing a case-hardening surface to yield a variety of anti-galling, erosion resistance, and corrosion resisting properties by means of a controlled process using micro-processing controls

'ammonia':8 'anti':31 'anti-gal':30 'base':9 'case':22 'case-harden':21 'control':43,49 'corros':36 'eros':33 'gall':32 'gas':10 'harden':23 'materi':3,14 'mean':5,40 'micro':47 'micro-process':46 'mixtur':11 'natur':17 'process':44,48 'properti':38 'provid':19 'resist':34,37 'surfac':24 'treatment':1,12 'use':45 'varieti':28 'yield':26

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