Guard for derrick apparatus

Details Guard for derrick apparatus Guard for derrick apparatus

2006-12-05

2006-12-05

Siegel, Mitchell (Department: 2912)

Machines not elsewhere specified

Agricultural or construction machinery

Drilling, mining, or soil treatment

Design Patent

active

D0533196

CLAIM:
The ornamental design for a guard for derrick apparatus, as shown and described.

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BJ 1986-87 Oil Field Products and Systems; BJ Hughes Drilling Equipment; cover page, pp. 7, 16; 1986.
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Powerful Hydraulic Compact Top Drive Drilling System; Tesco Drilling Technology; 2 pp.; Apr. 1998.

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