Sight testing machine, details of step gauge

Object Title

Sight testing machine, details of step gauge

Sight testing machine, details of step gauge

Reference

ENF 7/3/2 AID/SAID 1089

Level

item

Extent

1 drawing

Access Conditions

Open access

Reproduction Conditions

Crown Copyright

Associations

Contents

  ENF 7/3/2 AID/SAID 1089 - Sight testing machine, details of step gauge