| 摘要 |
<p>1,168,793. Mine roof supports. K. M. GROETSCHEL. 21 April, 1966 [21 April, 1965], No. 53962/66. Divided out of 1,168,792. Headings E1E and E1P. The subject matter is the same as that of Specification 1,168,792 but the claims are directed towards the extendable long beam carried by the superstructure.</p> |
