Google says this is a soap holder. Never seen one. Useful?
Not really today with all kinds of liquid soap in dispensers. My paternal grandmother had one in the guest room bath.Google says this is a soap holder. Never seen one. Useful?
That one's not mine or hers, just a found image. “Don’t worry”, you won't need to bend over to pick up the soap?The spanish word "tranquilo" drew my attention ... where did your grandma get that thing?
Had one on my drafting table.
A stack of Cryptographic keying cards?

As the raid came rather unexpectedly, communications personnel had to rush in order to get all crypto gear destroyed in time. The image above shows part of the communications room in the embassy, with a KW-7 unit clearly visible at the front. It has been pulled out of the 19" rack, the top has been removed and the critical cipher board have been taken out and destroyed.
A lead pointer.Had one on my drafting table.
Have used those many times and I have some smaller versions of them with all of my drafting tools. I used to love drafting and did several things for fun, such as draw up a three-view vision of space fighters and then use those to do an orthographic projection of them. Still have a couple of those lying around, including one I did in 9th grade after taking a semester-long drafting class. I keep hanging on to all of that stuff because of the good memories associated with it, but as I do more decluttering, I will probably break down and convince myself that it is time to let it all go.
80-column punch cards. Used for LOTS of different things, from storing computer programs to data records to configuration information for various pieces of hardware. At least a few people used them for going group testing via superimposed codes, but I don't know if that was ever done in anything other than research and proof-of-concept situations.