"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
|3954495||Process for the production of pigments useful for waxless carbon paper|
Pigment preparations containing carbon black, blue pigment and a wetting agent are prepared having an intimate inseparable mixture based on the total amount of pigment of 60-95 wt. % carbon black pigment and 40 to 5 wt. % blue pigment and based on 100 par...