FR723460A - Improvements in signaling devices for mines and the like - Google Patents

Improvements in signaling devices for mines and the like

Info

Publication number
FR723460A
FR723460A FR723460DA FR723460A FR 723460 A FR723460 A FR 723460A FR 723460D A FR723460D A FR 723460DA FR 723460 A FR723460 A FR 723460A
Authority
FR
France
Prior art keywords
mines
signaling devices
signaling
devices
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
Raymond Malcolm David Button
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 FR723460A publication Critical patent/FR723460A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B19/00—Mining-hoist operation
    • B66B19/06—Applications of signalling devices
FR723460D 1930-10-09 1931-09-29 Improvements in signaling devices for mines and the like Expired FR723460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB723460X 1930-10-09

Publications (1)

Publication Number Publication Date
FR723460A true FR723460A (en) 1932-04-09

Family

ID=10495129

Family Applications (1)

Application Number Title Priority Date Filing Date
FR723460D Expired FR723460A (en) 1930-10-09 1931-09-29 Improvements in signaling devices for mines and the like

Country Status (1)

Country Link
FR (1) FR723460A (en)

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