4. Medical and laboratory equipment
  5. Prophylactic article
  6. Ear plug or nose clip

Ward B. Krause

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Ear plug

Medical and laboratory equipment – Prophylactic article – Ear plug or nose clip
Patent

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Ear plug

Medical and laboratory equipment – Prophylactic article – Ear plug or nose clip
Patent

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Earplug with form-fitting fluid chambers

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Push-button switch

Electricity: circuit makers and breakers – Solid contact – Push button operated
Patent

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Profile ID: LFUS-PAI-P-295097

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