| 摘要 |
Biaxially oriented, hollow plastic bottle of thermoplastic material having an improved base. The base includes a plurality of circumferential rings occupying substantially the entire space between the central portion of the base and the outer supporting rim of the base. In one embodiment, the rings form substantially uniform, continuous, uninterrupted, circumferential, pyramidal ridges and adjacent depressions. In a further embodiment, some of the rings are interrupted by flat areas.
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