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Teknologi ke 4
• Tenanga Manusia
Semasa perang, sebelum ada telepon, SMS, e-mail, bahkan surat, para tentara Jerman bertukar pesan menggunakan cahaya. Dan cahaya itu dihasilkan dari tenaga manusia atau kayuhan sepeda. Bertukar pesan dengan cahaya itu maksudnya semisal, mengedipkan cahaya sebanyak 3 kali itu tandanya ada bahaya.
Teknologi ke 5
• Toa (berukuran besar)
Toa digunakan tentara AS untuk menyampaikan pengumuman menggunakan alat yang super besar itu.
Teknologi ke 6.
• Pohon samaran
Berfungsi sebagai penyamaran pada masa itu. Alat tersebut dibuat dari kanvas dan kasa kawat.
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