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That's what I thought ... they seem more 'modern' than the counterweight systems.

You're kidding - predate? So they are like 1850s or something?!?! I would have thought they'd be more recent! I've got counterweight systems and they are 1870s and 1900s respectively. This house has an extension with springs in the windows but it is an aluminium window from the 1970s. Every...