ALEXANDRIA, Va., Dec. 2 -- United States Patent no. D1,104,301, issued on Dec. 2, was assigned to EZZY FIT PTY LTD (Capalaba, Australia).
"Hollow sleeper" was invented by Rolf Bytschewsky (Capalaba, Australia).
The patent was filed on Nov. 30, 2023, under Application No. D/919,008.
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