Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
  • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21C—MINING OR QUARRYING
  • E21C27/00—Machines which completely free the mineral from the seam
  • E21C27/20—Mineral freed by means not involving slitting
  • E21C27/28—Mineral freed by means not involving slitting by percussive drills with breaking-down means, e.g. wedge-shaped tools

Landscapes

• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Interface Circuits In Exchanges (AREA)
• Telephonic Communication Services (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6477562

Family Applications (2)

Family Applications After (1)

Country Status (3)

• 0
  • NL NL40027D patent/NL40027C/xx active
  • NL NL67333D patent/NL67333C/xx active
• 1933
  • 1933-11-07 GB GB30959/33A patent/GB429095A/en not_active Expired
  • 1933-11-07 FR FR764899D patent/FR764899A/fr not_active Expired

Also Published As

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