1977 Headset Hardhat Adapter Patent

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1977 Headset Hardhat Adapter Patent 图片 1

1977 Cliff Read Headset Hardhat Adapter Patents. Canadian Headset Hardhat Adapter Patent Dated February 14th 1977. USA Headset Hardhat Adapter Patent Dated June 13th 1978. BNR Model Wearing Headset Hardhat Adapter.

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