4. Locks
  5. Special application
  6. For closures

Ching H. Yeh

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Construction for a cylinder lock and key

Locks – Operating mechanism – Key
Patent

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Lock device with concealed mounting screws

Locks – Special application – For closures
Patent

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Lock for fire-escape door

Locks – Special application – For closures
Patent

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Profile ID: LFUS-PAI-P-698281

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