David C. Johnstone

Details David C. Johnstone David C. Johnstone

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

Inventor

active

Affiliated with

Also associated with

No associations

Rating

David C. Johnstone does not yet have a rating. At this time, there are no reviews or comments for this inventor.

If you have personal experience with David C. Johnstone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and David C. Johnstone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-P-712811