I wonder When the wording was intentional or if they just meant to state that buildings with enclosed mezzanines meeting XXX parameters are needed to have two exits. The theremin makes use of the heterodyne principle to deliver an audio sign. The instrument's pitch circuitry involves two radio frequency oscillators https://elliottnesly.ezblogz.com/69960642/mezzanine-safety-gate-uk-no-further-a-mystery