4. Boring or penetrating the earth
  5. Bit or bit element
  6. Bit with leading portion forming smaller diameter initial bore
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C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 ! " $ ' ( ) * , - / : < = > ? @ [ \ ] ^ ` { | } ~ €

Baker Donald R.

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Barr Thomas R.

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Behrens Robert N.

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Blue Streak Industries, Inc.

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Bobrosky Douglas J.

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Brungs Anders

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Burton Michael T.

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