Patent GB9977 (http://l2.espacenet.com/dips/viewer?PN=GB9977&CY=gb&LG=en&DB=EPD)
, "Shaping Pills, Lozenges and Black Lead by Pressure in Dies:" Other early patents of interest are:Patent US152666 (http://l2.espacenet.com/dips/viewer?PN=US152666&CY=gb&LG=en&DB=EPD)
;Patent US156398 (http://l2.espacenet.com/dips/viewer?PN=US156398&CY=gb&LG=en&DB=EPD)
;Patent US168240 (http://l2.espacenet.com/dips/viewer?PN=US168240&CY=gb&LG=en&DB=EPD)
;Patent US174790 (http://l2.espacenet.com/dips/viewer?PN=US174790&CY=gb&LG=en&DB=EPD)
;Patent US189005 (http://l2.espacenet.com/dips/viewer?PN=US189005&CY=gb&LG=en&DB=EPD)
;Patent US215452 (http://l2.espacenet.com/dips/viewer?PN=US215452&CY=gb&LG=en&DB=EPD)
;Patent US251678 (http://l2.espacenet.com/dips/viewer?PN=US251678&CY=gb&LG=en&DB=EPD)
;Patent US256573 (http://l2.espacenet.com/dips/viewer?PN=US256573&CY=gb&LG=en&DB=EPD)
;Patent US260828 (http://l2.espacenet.com/dips/viewer?PN=US260828&CY=gb&LG=en&DB=EPD)
&Patent US276828 (http://l2.espacenet.com/dips/viewer?PN=US276828&CY=gb&LG=en&DB=EPD)
8)https://www.rhodium.ws (https://www.rhodium.ws)