anyone understand card table hinges?

Card Table Hinge Side Mount

Antique Card Table Hinge Game Table Hinge Furniture Cabinet Hinge

Card Table Hinge - A162 : Optimum Brasses

Fielect Hinge Assembly 5.2''Folding Table Hinge Legs Folding Work

Card Table Hinge, Material Solid Cast Brass., Size 1 3/8 Closed by 2 1/2 Closed, Sold in pairs.

Card Table Hinge (SKU 12240)

Self-Supporting Hinge, for Folding and Sewing Machine Tables - in

Happy Teachers' Day Bingo Card

Antique Card Table Hinge Game Table Hinge Furniture Cabinet

Card Table Hinge (SKU 12240) - Ansaldi Furniture Hardware

H-53 Card Table Hinge