Matrix head calculator printer

Matrix print head

Matrix print head and solenoid driver

Matrix print head impact energy control

Matrix print head repetition rate control

Matrix print head with improved armature retainer

Matrix printer comprising lubricated printing wires

Matrix printer comprising one or more stackable groups of printi

Matrix printer having detachable elements

Matrix printer having document thickness compensating device

Matrix printer head having a removable assembly

Matrix printer incorporating intermittent ink ribbon transport

Matrix printing head

Matting device

Means and method for enhancing ribbon lift

Means for adjusting an extractor for cotton stripper

Means for controlling density of non-woven fiber webs

Means for controlling fiber-drawing apparatus

Means for conveying pathological specimens safely to places of i

Means for equalizing heat expansion in a carding machine