Suchergebnisse - Ringwald, F.

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  1. 1
    Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production

    Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production

    Beteiligte: Ringwald, F.
    Veröffentlicht: 1955
    Verlag: United Nations, Economic Commission for Europe
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  2. 2
    Formulation of a method for heating hot-houses by electricity and waste steam from thermal plants for the purpose of growing vegetables and early produce throughout the year

    Formulation of a method for heating hot-houses by electricity and waste steam from thermal plants for the purpose of growing vegetables and early produce throughout the year

    Beteiligte: Ringwald, F.
    Veröffentlicht: 1955
    Verlag: United Nations, Economic Commission for Europe
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