Air Survey Stereocomparators

	1. Cambridge Stereocomparator - SMS		2. Cambridge Stereocomparator Egypt 1940		3. Cambridge Stereocomparator Labelled - Gordon		4. Cambridge Stereocomparator Labelled 2 - Gordon
	5. Cambridge Stereocomparator OS - Wood		6. Hilger Watts Stereocomparator Block 101 Barton Stacey 1		7. Hilger Watts Stereocomparator Block 101 Barton Stacey 2		8. Hilger Watts Stereocomparator Block 101 Barton Stacey 3
	9. Hilger Watts Stereocomparator Block 101 Barton Stacey 4