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Peter J. Cook
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Johannesburg, ZA
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Patents Grants
last 30 patents
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Patent Grant
Prop headboard
Patent number
5,658,099
Issue date
Aug 19, 1997
HL & H Timber Products (Propreitary) Limited
Frans Roelof Petrus Pienaar
E21 - EARTH DRILLING MINING
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Patent Grant
Mine prop headboard
Patent number
5,427,476
Issue date
Jun 27, 1995
HL&H Timber Products (PTY) Ltd.
Frans R. P. Pienaar
E21 - EARTH DRILLING MINING
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Patent Grant
Yieldable load support
Patent number
5,318,387
Issue date
Jun 7, 1994
H L & H Timber Products (Proprietary) Limited
Frans R. P. Pienaar
E21 - EARTH DRILLING MINING