[Closed] in-line skates

just watched an Antique show and saw a pair of Victorian 'in-line skates'.... metal things with leather straps and wheels.... pretty interesting i thought.. so way back in the early 'seventies' we all had those metal skates with leather straps (but 4 wheels)...i wonder why they changed them to 4 wheels in the 1970,s.... then of course they went plastic years later with 4 wheels...then back to in-line tp present date...... just shows you the victorian era new there stuff..lol...just a random observation 😉