Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q3/00—Selecting arrangements
  • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J19/00—Normal steroids containing carbon, hydrogen, halogen or oxygen, substituted in position 17 by a lactone ring
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J75/00—Processes for the preparation of steroids in general
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/02—Constructional features of telephone sets
  • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/26—Devices for calling a subscriber
  • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q1/00—Details of selecting apparatus or arrangements
  • H04Q1/18—Electrical details
  • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
  • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
  • H04Q1/34—Impulse regenerators with mechanical or other non-electrical marking arrangements

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Computer Networks & Wireless Communication (AREA)
• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Signal Processing (AREA)
• Interface Circuits In Exchanges (AREA)

Applications Claiming Priority (6)

Publications (1)

Family

ID=27544975

Family Applications (1)

Country Status (2)

• 0
  • NL NL70511D patent/NL70511C/xx active
• 1950
  • 1950-10-01 DE DEI3002A patent/DE857821C/de not_active Expired

Also Published As

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