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Variable-Pitch Propeller 1922 Poster
The sheetVariable-Pitch Propeller 1922Everything with this design46 USD
Made for youWe make your piece after you order. It arrives between 9 and 16 Nov, and shipping is free.
Frank W. Caldwell's variable-pitch or reversible propeller, granted on 24 January 1922: the hub that lets the blades change their angle in flight.
US patent 1,404,269 · sheet 1 · granted 24 January 1922
The paper
Thick matte paper, 189 g/m². Sent rolled, unframed. The whole patent sheet in navy on the white paper, with the sheet’s title in Arabic and its patent number at the foot. Drawn from the patent office’s scan of the sheet at 300 dpi; the patent is in the public domain.
Size
One size: 12 × 16 in (30 × 40 cm).
Shipping
Free and tracked. The carrier may collect import tax on delivery. Arrived damaged, misprinted or wrong? Write within 14 days with a photo and we replace it or refund you.
Care
Keep out of direct sun and damp.
