FR686007A - Observation device for various entrances and premises - Google Patents

Observation device for various entrances and premises

Info

Publication number
FR686007A
FR686007A FR686007DA FR686007A FR 686007 A FR686007 A FR 686007A FR 686007D A FR686007D A FR 686007DA FR 686007 A FR686007 A FR 686007A
Authority
FR
France
Prior art keywords
premises
observation device
various entrances
entrances
various
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Albert Hirt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR686007A publication Critical patent/FR686007A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00—Special arrangements or measures in connection with doors or windows
    • E06B7/28—Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners
    • E06B7/30—Peep-holes; Devices for speaking through; Doors having windows

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
FR686007D 1929-03-01 1929-03-01 Observation device for various entrances and premises Expired FR686007A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR686007T 1929-03-01

Publications (1)

Publication Number Publication Date
FR686007A true FR686007A (en) 1930-07-21

Family

ID=9025291

Family Applications (1)

Application Number Title Priority Date Filing Date
FR686007D Expired FR686007A (en) 1929-03-01 1929-03-01 Observation device for various entrances and premises

Country Status (1)

Country Link
FR (1) FR686007A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437458A (en) * 1945-09-18 1948-03-09 Nasa Inspection periscope
US2491758A (en) * 1947-09-17 1949-12-20 Nichols Abe Peephole for doors
US2753760A (en) * 1948-09-25 1956-07-10 Lawrence E Braymer Multiple image telescope
DE1094438B (en) * 1956-02-18 1960-12-08 Saint Gobain Adjustable wall element with a viewing opening for observing the interior of rooms
EP0297755A1 (en) * 1987-06-30 1989-01-04 Richard Ruben Ritchie Viewing and oral communications assembly for doors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437458A (en) * 1945-09-18 1948-03-09 Nasa Inspection periscope
US2491758A (en) * 1947-09-17 1949-12-20 Nichols Abe Peephole for doors
US2753760A (en) * 1948-09-25 1956-07-10 Lawrence E Braymer Multiple image telescope
DE1094438B (en) * 1956-02-18 1960-12-08 Saint Gobain Adjustable wall element with a viewing opening for observing the interior of rooms
EP0297755A1 (en) * 1987-06-30 1989-01-04 Richard Ruben Ritchie Viewing and oral communications assembly for doors
WO1989000234A1 (en) * 1987-06-30 1989-01-12 Richard Ruben Ritchie Viewing and oral communications assembly for doors

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