Hidden releasable barcode or QR code for indicating mating or non-mating of two elements, and operation thereof

A method for operating a releasable barcode or QR code for indicating mating, when the releasable barcode or QR code is exposed, or non-mating, when the releasable barcode or QR code is concealed, of two elements, comprising the steps of:

• providing a concealing feature which indicates the non-mating of said two elements;
• and providing an indicating feature which, in its entirety, indicates the mating of said two elements, wherein said concealing feature and said indicating feature are one and of a same structure with no relative motion between said concealing feature and said indicating feature,
• wherein said same structure on which said concealing feature and said indicating feature are located is a rotatable platter,
• wherein said concealing feature is an upper side of said rotatable platter, and
• wherein said indicating feature is an underside of said rotatable platter having said barcode or QR code thereon.

A releasable barcode or QR code for indicating mating, when the releasable barcode or QR code is exposed to a detector, or non-mating, when the releasable barcode or QR code is, in its entirety, concealed from the detector, of two elements, comprising:

• a concealing feature which indicates the non-mating of said two elements;
• an indicating feature which, in its entirety, indicates the mating of said two elements,
• wherein said concealing feature and said indicating feature are one and of a same structure with no relative motion between said concealing feature and said indicating feature,
• wherein said same structure on which said concealing feature and said indicating feature are located is a rotatable platter,
• wherein said concealing feature is an upper side of said rotatable platter, and
• wherein said indicating feature is an underside of said rotatable platter having said barcode or QR code thereon.

A method for operating a releasable barcode or QR code for indicating mating, when the releasable barcode or QR code is exposed to a detector, or non-mating, when the releasable barcode or QR code is, in its entirety, concealed from the detector, of two elements, comprising the steps of:

• providing a concealing feature which indicates the non-mating of said two elements;
• and providing an indicating feature which, in its entirety, indicates the mating of said two elements, wherein said concealing feature and said indicating feature are one and of a same structure with no relative motion between said concealing feature and said indicating feature,
• wherein said same structure on which said concealing feature and said indicating feature are located is a rotatable platter,
• wherein said concealing feature is an upper side of said rotatable platter, and
• wherein said indicating feature is an underside of said rotatable platter having said barcode or QR code thereon.