Does anyone have any idea of how to make this slot machine

loop slot   Dan loop slot

A compact dual-frequency and dual-band square microstrip patch antenna has been designed using loop like slot on the patch and rectangular slot

Jacket Slot Belt Loop with Duty Holster Screws Designed to fit any Blackhawk injection-molded duty holster, it allows easy attachment of the holster to your NON-SHRINK GROUT IN SAW SLOT 1 BACKER ROD IN SAW SLOT PREFORMED LOOP IN SAW SLOT LOOP WIRE PLAN SHEET LAYOUT DETAIL SPECIFIED ON NUMBER OF TURNS

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