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field, field, field and chang: Chart showing gas detector locations
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field, field, field and chang: Detail from old light switch
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field, field, field and chang: Sign for hoist isolating switch
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field, field, field and chang: Sockets on test panel
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field, field, field and chang: Hand-painted labelling on old PBX equipment
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field, field, field and chang: Detail from panel of blocking keys
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field, field, field and chang: Old Ericsson transfomer
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field, field, field and chang: Manufacturer's plate from old Ericsson transformer
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field, field, field and chang: Detail from old alarm panel
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field, field, field and chang: Alarm lights
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field, field, field and chang: 2S1A8955
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field, field, field and chang: The page referred to in the label on the equipment in this shot: https://www.flickr.com/photos/fffandc/32143933456/in/album-72157678797259156/