ISO 9999 codes:
24 Assistive products for controlling carrying moving and handling objects and devices,
24 18 Assistive products to replace arm function, hand function, finger function, or combonation of these functions
Source:
source - - - Full text at
,
How to Make It Cheap Volume 1 - - - Full text at https://archive.org/details/cheap-manual-vol-1
source - - - Full text at
,
How to Make It Cheap Volume 1 - - - Full text at https://archive.org/details/cheap-manual-vol-1