This special group is believed to comprise nearly all kinds of man - made household artifacts , such as kitchenware , tools and every - day accessories , when 100 years have passed .
The artifact was as good as if group had never been used .
This special group is believed to comprise nearly all kinds of man - made household artifacts , such as kitchenware , tools and every - day accessories , when 100 years have passed and the artifact was as good as if it had never been used .