Assertion: reed's frame | /r/CapableOf | bear total tension of 18 tons
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Source sentences:
text: With the adoption of such frames, the tension exerted by each string (about 24 pounds [11 kilograms] for an English piano of 1800) rose to an average of approximately 170 pounds (77 kilograms) in modern instruments, the frame bearing a total tension of 18 tons.