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  • OB – Oval Bellows (20×60–65×170 mm/0.9×2.4″–3.0×7.0″)
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  • OBF – Oval Bellows Friction (15×35–65×170 mm/2.0×4.1″–3.2×7.4″)
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  • OBL – Oval Bellows Long (40×90 mm/1.8X3.7″)
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  • F-OB – Food, Oval Bellows, non-detectable (10×30–30×60 mm/0.39×1.18–1.18×2.36”)
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  • F-OB – Food, Oval Bellows, detectable (10×30–30×60 mm/0.39×1.18–1.18×2.36”)
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