Pages that link to "Item:Q31193"
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The following pages link to Joseph H Labrum (Q31193):
View (previous 50 | next 50) (20 | 50 | 100 | 250 | 500)- Patent for a shutter system for stage-lighting spotlights by Joseph H Labrum (Q31194) (← links)
- patent for a light-collecting reflector by Joseph H Labrum (Q31196) (← links)