4B [Scope of Convention (issues excluded): exclusivity agreement];

8C [Interpretation of party's statements or other conduct: interpretation in light of surrounding circumstances];

9C [Practices established by the parties];

25B [Definition of fundamental breach: substantial deprivation of expectation]

29A [Parties may modify contract by agreement, without consideration];

38A [Buyer's obligation to examine goods: time for examining goods];

39A [Requirement to notify seller of lack of conformity: buyer must notify seller within reasonable time];

44A [Excuse for failure to notify pursuant to art. 39(1): art. 44 not cited but excuse present (for complicated and unique equipment, the strict precedents from simple goods are not applicable; notice is not a matter of weeks)];

64A1 [Seller's right to avoid contract (grounds for avoidance): fundamental breach of contract (non-payment of purchase price)]