helpers
helper [In the process of cutting a raise] the helpers are those four holes in the diagram designated by H. [Fig. 1] DNE-cit JH-25-11-69 Not Used Not used Withdrawn Checked by Jordyn Hughes on Mon 20 Apr 2015, stamped but not used
Format: | Manuscript |
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Language: | English |
Published: |
1969
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Subjects: | |
Online Access: | http://collections.mun.ca/cdm/ref/collection/elrcdne/id/34135 |
Summary: | helper [In the process of cutting a raise] the helpers are those four holes in the diagram designated by H. [Fig. 1] DNE-cit JH-25-11-69 Not Used Not used Withdrawn Checked by Jordyn Hughes on Mon 20 Apr 2015, stamped but not used |
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