perform theirduties to the company 解释：3rdparty可以默认agent 或者officers 在签合同时没有breach 任何duty，合同有效。场景5:agent 拿了一份合同和3rd party签，并确认这份是合同的final copy。这时公司说这份不是final copy，这个合同无效。3rdparty可以用s129（7）来enforcethe contract against to the company.S129 (7) officer or agent with authority to warrant thatdocument is genuine or true copy. 解释：3rdparty 可以默认agent 有权力确认哪一份文件是true copy. 公司是没有这个权利的。如 果 在 考 试 中 需 要 应 用 多 条s129 中 的 条 例 来 保 护3rdparty需 要 引 用 Fiberi’s case. （under Fiberi‘scase ,all statutory assumption can be reliedupon by 3rd party.写了s129 statutory assumption,必须写s128（4）s128（4）是什么情况下3rd party不可以用s 129 来保护自己。A person is not entitled to make an assumptionin s129 in at the time of the dealings they knewor suspected that the assumption was incorrect.解释：如果3rd party有理由怀疑agent 是有问题的，是没有得到授权的，没有double check 但是依旧钱了合同，那么s129 无效。
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