Grey Platignum Quick Change founatin pen Designer (Person) Unknown Manufacturer Platignum Date 1930 - 1939 (circa)
Green Platignum Quick Change founatin pen Designer (Person) Unknown Manufacturer Platignum Date 1930 - 1939 (circa)
Petrous PRMC-1 calculator Designer (Person) Unknown Manufacturer Petrous Electronic Corp Date 1970 - 1999 (circa)