N.D. Cent. Code § 35-24-10
35-24-10. Continuing deliveries under single contract
35-24-10. Continuing deliveries under single contract
All labor performed or materials or services furnished by any person entitled to a lien under
this chapter upon the same leasehold for oil and gas purposes or the same pipeline must for the
purposes of this chapter be considered as having been performed or furnished under a single
contract regardless of whether or not the same was performed or furnished at different times or
on separate orders, provided that no more than six months may have elapsed between the date
of performance of such labor or the date of furnishing such material or services and the date on
which labor is next performed or materials or services are next furnished.