The present disclosure provides composite prosthetic devices comprising two or more layers of electrospun polymers and methods of preparation thereof. The holder further includes a securing tab assembly formed at the opposite end of the holder to secure or lock the electronic device in the cradle. The invention also relates to methods for producing a soybean plant containing in its genetic material one or more transgenes and to the transgenic soybean plants and plant parts produced by those methods. The processing unit determines if it is necessary to adjust the transparent degree of a transparent image displayed by the transparent display unit or not according to a sensing result detected by the sensing module. The optical system additionally includes a table for receiving sample holders for samples ; an optical arrangement for imaging a second focal point ; an aperture plate positioned in the second focal point ; a first spectral filter ; and a first detector. A method for automatically presenting a clean towel section for drying purposes and for washing and drying soiled towel sections in a towel presenting and washing machine, is also provided.