When glass was first used for windows, it was rare and expensive. Slowly it became the norm in upper class homes, it became standard in home in the past century. The glass used in the nineteenth century was simple to make, single paned and often had flaws that antique shoppers find valuable today. Single pane glass with no other features have been used for the past few decades. In the recent decade with the push to go green, conserve energy, and increase security, glass technology has advanced significantly making windows today superior to their counterparts of even just a few years ago.
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