4. Acoustics
  5. Auditorium

H. K. Porter Company, Inc.

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Asbestos free friction element

Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent

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Continuous manufacture of reinforced hose

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent

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Current conductor system

Electricity: transmission to vehicles – Conductors – Trolley
Patent

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Double side air break disconnecting switch

Electricity: circuit makers and breakers – High-potential type – Rotating and pivoted
Patent

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Muffler

Acoustics – Auditorium
Patent

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