CH54828A - Blackboard - Google Patents

Blackboard

Info

Publication number
CH54828A
CH54828A CH54828A CH54828DA CH54828A CH 54828 A CH54828 A CH 54828A CH 54828 A CH54828 A CH 54828A CH 54828D A CH54828D A CH 54828DA CH 54828 A CH54828 A CH 54828A
Authority
CH
Switzerland
Prior art keywords
blackboard
Prior art date
Application number
CH54828A
Other languages
German (de)
Inventor
Jakob Rudolf
Original Assignee
Jakob Rudolf
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 by Jakob Rudolf filed Critical Jakob Rudolf
Publication of CH54828A publication Critical patent/CH54828A/en

Links

CH54828A 1911-12-18 1911-12-18 Blackboard CH54828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH54828T 1911-12-18

Publications (1)

Publication Number Publication Date
CH54828A true CH54828A (en) 1912-06-17

Family

ID=4294325

Family Applications (1)

Application Number Title Priority Date Filing Date
CH54828A CH54828A (en) 1911-12-18 1911-12-18 Blackboard

Country Status (1)

Country Link
CH (1) CH54828A (en)

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