4. Machine element or mechanism
  5. Control lever and linkage systems
  6. Multiple controlled elements

The Charles Machine Works, Inc.

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Anchor assembly

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Angle sensor for a steerable boring tool

Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent

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Angle sensor using thermal conductivity for a steerable boring t

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent

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Apparatus and method for determining boring direction when borin

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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Apparatus and method for maintaining control of a drilling...

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Profile ID: LFUS-PAI-P-8173

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