OT but it's a real shame the bubble LED displays used in those calculators are not manufactured anymore. Something about the warm red glow and incandescent-like

OT but it's a real shame the bubble LED displays used in those calculators are not manufactured anymore. Something about the warm red glow and incandescent-like filament look appeals to me. They are also very compact, it's occasionally possible to find more recent bubble displays but quite bulkier, and outrageously expensive.