CA700821A - Self-drilling shield structure - Google Patents

Self-drilling shield structure

Info

Publication number
CA700821A
CA700821A CA700821A CA700821DA CA700821A CA 700821 A CA700821 A CA 700821A CA 700821 A CA700821 A CA 700821A CA 700821D A CA700821D A CA 700821DA CA 700821 A CA700821 A CA 700821A
Authority
CA
Canada
Prior art keywords
self
shield structure
drilling shield
drilling
shield
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA700821A
Inventor
W. Bell Lewis
Peskin Izhar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Star Expansion Industries Corp
Original Assignee
Star Expansion Industries Corp
Publication date
Application granted granted Critical
Publication of CA700821A publication Critical patent/CA700821A/en
Expired legal-status Critical Current

Links

CA700821A Self-drilling shield structure Expired CA700821A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA700821T

Publications (1)

Publication Number Publication Date
CA700821A true CA700821A (en) 1964-12-29

Family

ID=36014474

Family Applications (1)

Application Number Title Priority Date Filing Date
CA700821A Expired CA700821A (en) Self-drilling shield structure

Country Status (1)

Country Link
CA (1) CA700821A (en)

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