Improved method of and apparatus for determining the surface hardness or resistance to scratching of smooth or polished surfaces of materials, or of coated objects or materials
摘要
申请公布号
GB541122(A)
申请公布日期
1941.11.13
申请号
GB19400010174
申请日期
1940.06.11
申请人
MERVYN JAMES CRADICK;ARNETT RICHARDSON DUNTON;METROPOLITAN - VICKERS ELECTRICAL COMPANY LIMITED
