Last Updated：2022/12/24
The shaft project No 7 of the Honan P'ing-ting-shan Colliery designed for an annual production capacity of 900,000 metric tons that went into production in August 1959 is more complex than the shaft No 3 of the Huai-nan Hsieh-chia-chi Colliery that went into production during the First Five Year Plan;…
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The
shaft
project
No
7
of
the
Honan
P'ing-ting-shan
Colliery
designed
for
an
annual
production
capacity
of
900,000
metric
tons
that
went
into
production
in
August
1959
is
more
complex
than
the
shaft
No
3
of
the
Huai-nan
Hsieh-chia-chi
Colliery
that
went
into
production
during
the
First
Five
Year
Plan;…
