| 21. | That's where the Erector set came in.
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| 22. | This arching of the back causes the erector spinae to increase its activity.
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| 23. | The pouch sits atop a cluster of gray metal steps resembling an erector set.
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| 24. | A giant Erector set, I call it.
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| 25. | On one side, all the members of the Willie Brown Erector Set Society.
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| 26. | The rooms come as modular components and assembly is similar to an erector set.
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| 27. | Construction with an Erector set is not easy; it's tedious work.
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| 28. | He described the Erector set as " an instrument of invention ."
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| 29. | The first Erector was made there in 1913.
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| 30. | The erector spinae sometimes indicated as raised planes.
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