Filters
Chinese Rings - Level 9 - Hung Ming
QED - unknown

Interlocking / Wood

Designer: unknown
Maker: Pentangle

Puzzling Pot Stand - unknown
'Chuck' The Transforming Puzzle Person - unknown
King's Court - Richard Tucker
Cross-Blocks Puzzle - unknown
Mind the Gap - Stewart Coffin
Triplemino - Laszlo Molnar
The Gordian Knot - Ron Cook
Mayer's Cube - Derek Mayer
Tangleweed - Geoff Wyvill
Traffic Lights - John Snow
The Devil's Halo - unknown
Pit-Stop - unknown

Sliding / Wood

Designer: unknown
Maker: Pentangle

The Worried Woodworm - unknown
Pyramid Puzzle - unknown
Holey Cross - William Altekruse
Clinch Cube - Bart Phillips
Grandpapachuck - unknown
Cornered - unknown