Période

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Alphonse Pénaud's helicopter which is driven by twisted rubber bands
ARP23A14_403

Alphonse Pénaud's helicopter which is driven by tw...

Alphonse Pénaud's helicopter which is driven by twisted rubber bands
ARP23A14_404

Alphonse Pénaud's helicopter which is driven by tw...

A helicopter design by Enrico Forlanini
ARP23A14_407

A helicopter design by Enrico Forlanini

A helicopter designed by French inventor J Melikoff
ARP23A14_406

A helicopter designed by French inventor J Melikof...

Photograph of a helicopter invented by Arthur M
ARP23A14_417

Photograph of a helicopter invented by Arthur M