"co-acting" meaning in English

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          "ref": "1952 February, “New Type of Signal Bridge Near Sunderland”, in Railway Magazine, page 88:",
          "text": "The old very high signals, for instance, affording a sky background at a considerable distance, and at times provided with co-acting arms lower down, are out of fashion now, although many still remain.",
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        "present participle and gerund of co-act"
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  "pos": "verb",
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        {
          "ref": "1952 February, “New Type of Signal Bridge Near Sunderland”, in Railway Magazine, page 88:",
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  "word": "co-acting"
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