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
Priority claimed from DE1907193553Dexternal-prioritypatent/DE193553C/de
Application filed by Wilhelm August Tepe, Karl BuechsenschuetzfiledCriticalWilhelm August Tepe
Application grantedgrantedCritical
Publication of AT38991BpublicationCriticalpatent/AT38991B/en
<Desc/Clms Page number 1>
EMI1.1
EMI1.2
<Desc/Clms Page number 2>
EMI2.1
Streifen die durchsichtisen Stellen der Glastafel abblenden.
Durch passend gewählte Lichtdurchlassöffnungen in der Schreibtafel und durch eine ent- sprechend ausgeführte Platte lassen sich daher jedes beliebige Liniensystem als auch Zeicbnungen, Vorlagen usw. auf der Schreibfl. che ohne Mühe erzeugen und zum Verschwinden bringen.
<Desc / Clms Page number 1>
EMI1.1
EMI1.2
<Desc / Clms Page number 2>
EMI2.1
Strip the transparent parts of the glass panel.
Through appropriately selected light passage openings in the writing board and through a correspondingly designed plate, any system of lines as well as drawings, templates, etc. can be placed on the writing surface. Create a surface without effort and make it disappear.
Claims (1)
PATENT-ANSPRUCH : Wandtafel für Lehrzwecke mit abwechselnd durchscheinenden und undurchsichtigen Stellen,
EMI2.2
EMI2.3
PATENT CLAIM: Blackboard for teaching purposes with alternating translucent and opaque areas,
EMI2.2
EMI2.3
AT38991D1907-03-251908-02-17
Blackboard for teaching purposes.
AT38991B
(en)
Flat recording medium with information applied by a printing process in the form of visually readable characters and with machine-scannable coded information