Sash Window facts

While investigating facts about Sash Windows and Sash Window Locks, I found out little known, but curios details like:

Modern Sash windows date as far back as the 1670s

how sash windows work?

What is a window sash on a casement window?

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across answering what is a window sash replacement. Here are 1 of the best facts about Sash Window Repair and Sash Window Restoration I managed to collect.

what is a window sash?