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1. Introduction 1.1 History of hydraulic accumulator 2. Types of hydraulic accumulator 2.1 Tower type accumulator 2.2 Raised weight accumulator 2.3 Spring-type accumulator 2.4 Compressed-gas accumulator a) Bladder type accumulator b) Diaphragm type c) Piston type accumulator d) Metal bellow type 3. Hydraulic symbols 4. Functions. 5. Design consideration 5.1 calculations 5.2 calculation of useful volume 6. Applications 6.1 Injection molding machine hydraulic circuit 6.2 Leakage Oil Compensation hydraulic circuit 6.3 Shortening of Stroke Time hydraulic circuit 7. Conclusion