1
Improvements in or relating to coal mining methods and apparatus therefor. Ladislaus Franz Trenczak, June 19, 1957: GB777328-A (1 worldwide citation)

777,328. Mineral-mining machines ; dust suppression in mines ; goaf filling machines. TRENCZAK, L. F. June 4, 1953 [June 7, 1952; Nov. 29, 1952; March 20, 1953], No. 15492/53. Classes 68 (1) and 85. The cutting means of a mineral-mining machine are disposed ahead of the self-propelled chassis of the ...


2
Improvements in or relating to apparatus for mining minerals. Ladislaus Franz Trenczak, October 31, 1951: GB659832-A

659,832. Mining-machines. TRENCZAK, L. F. March 7, 1949, No. 6183. Convention date, March 12, 1948. [Class 68 (i)] A mining machine in which a cutter unit is disposed at each end of the machine and comprises over and undercutter endless cutter chains 4, 5 running around triangular frames which are s ...