| http://www.w3.org/ns/prov#value | - The combination recited in claim 1, in which said pivotal means is a strongback pivotally connected at its central portion to said boom, and said clamping means are spaced lengthwise of the strongback and project downwardly therefrom while the strongback is in its lower position, and said combination including means below the lowered strongback for raising substantially horizontal drill pipe up to
|
