|
US3893795A
|
|
Embossing rolls with areas of differential hardness
|
|
US3935359A
|
|
Retroreflective sheeting and method and apparatus for producing same
|
|
US3839514A
|
|
Method of embossing thermoplastic sheet using a roll having a surface of varying hardness
|
|
US3924958A
|
|
Highway retroreflecting marker
|
|
US3830682A
|
|
Retroreflecting signs and the like with novel day-night coloration
|
|
US3792678A
|
|
Emergency warning sign with readily collapsible frame
|
|
US3811983A
|
|
Method for producing retroreflective sheeting
|
|
US3810804A
|
|
Method of making retroreflective material
|
|
US3689346A
|
|
Method for producing retroreflective material
|
|
US3684348A
|
|
Retroreflective material
|
|
US3751550A
|
|
Method for making differential durometer faced rolls
|
