ch:person=18062167
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<ref name=CH>{{cite web |url=https://collection.cooperhewitt.org/people/18062167/ |title=Robert Greenberg |author=Cooper Hewitt, Smithsonian Design Museum |accessdate=23 April 2024 |publisher=Smithsonian Institution}}</ref>
![A black, rectangular, molded plastic calculator with a sloped screen. A raised numerical and mathematic functional keyboard runs along the front with white, turquoise and black keys. The words [HEWLETT.PACKARD] are printed in white capital letters beside a black and blue rectangular logo with hp in printed in a white circle along the bottom edge of the plastic casing.](https://images.collection.cooperhewitt.org/331404_c4df0595ef0b2f43_n.jpg "HP-35 Scientific Pocket Calculator")
![A square black molded plastic alarm clock with a circular dial delineated with white lines and the white numbers 12, 3, 6 and 9 marking hours and minutes. Two thick white plastic stips act as hour and minute hands, whilst a smaller yelow plastic stip acts as a second hand. The word [BRAUN] is printed in white capital letters in the upper left and the word [quartz] is printed in white on the upper right. The black alarm button is raised with a red arrow printed in its center.](https://images.collection.cooperhewitt.org/333534_ba1034d93996b92f_n.jpg "AB 21/s Travel Alarm Clock")
