PENCILS PENCIL LEADS

Brand	Owner (click to sort)	Address	Description
DURALAR	J. S. STAEDLER	NURNBERG GERMANY	PENCILS AND PENCIL LEADS;
MARS-DURAGRAPH	J. S. STAEDTLER	RUCKERSTRASSE 9 NURNBERG Germany	PENCILS AND PENCIL LEADS;
OMR	DUR-O-LITE, INC.	1401 N. 25TH AVENUE MELROSE PARK IL 60160	PENCILS AND PENCIL LEADS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

An auto-control pencil suitable for pen leads of different sizes comprises a pen tube; a guide tube; a push rod; a spring; a rotary head; an inner head; and an outer head. When an inner head is pressed downwards along the outer head, the presses at the front end of the inner head will reduce inwards so that one end of the pen lead resists against the opening at the front end of a push rod and moreover another end thereof is clamped by the presses so that the two ends of the pen leads are fixed. Pen leads of different sizes can be used. Thus one pen is sufficient.