Farm technology. Joint Issue with Netherlands

Number by catalogue:  Yvert: 4296   Scott: 3452  

Perforation: Comb   Perforation type: 12x12

Subject:

80 fens. The big chinese hydraulic wheel for irrigation. Sheeps

Number by catalogue:  Yvert: 4297   Scott: 3453  

Perforation: Comb   Perforation type: 12x12

Subject:

80 fens. The windmill using a strength of wind for pumping out of water polders*

Additional:

*A polder is a low-lying tract of land enclosed by embankments known as dikes, that forms an artificial hydrological entity, meaning it has no connection with outside water other than through man operated devices