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model electronics general physics geography & working models math lab abacus place value allotting base ten block board game circle cubes date & finance fractions geometry items identities maths kit maths theorems measurement number concept number crunching pattern block time trigonometry optical instruments...
model electronics general physics geography & working models math lab abacus place value allotting base ten block board game circle cubes date & finance fractions geometry items identities maths kit maths theorems measurement number concept number crunching pattern block time trigonometry optical instruments...
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designed to allow safe and quick sampling of volatile liquids under pressure on process lines, storage tanks or pressure vessels. depressing the manual lever releases a spring-assisted plunger to draw off liquid. releasing the lever resets the viton or teflon seal against the valves machined seating surface...
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