NAVAL EDUCATION AND TRAINING PROFESSIONAL DEVELOPMENT AND TECHNOLOGY CENTER: Fluid Power. [dostęp 2020-04-30]. [zarchiwizowane z tego adresu (2019-12-06)].
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NAVAL EDUCATION AND TRAINING PROFESSIONAL DEVELOPMENT AND TECHNOLOGY CENTER: Fluid Power. [dostęp 2020-04-30]. [zarchiwizowane z tego adresu (2019-12-06)].