Advocates:
A.K.MUKHERJEE, B.L.PAL, C.ROY, N.C.CHATTERJI, N.C.Sen, P.K.CHATTERJI, R.R.BISWAS

Certainly. Based on the provided legal document, here are the key points summarized:

1. The principle of constructive res judicata applies to execution proceedings, meaning that issues not raised at the appropriate time cannot be reopened later to challenge jurisdiction or other fundamental aspects of the execution process (!) (!) .

2. If a judgment-debtor fails to object to jurisdiction or other objections that go to the root of the matter during execution proceedings, such objections are generally barred by res judicata, even if they are based on erroneous decisions or irregularities, provided the court had jurisdiction at the time (!) (!) .

3. The sending of a certificate of non-satisfaction under section 41 of the Civil Procedure Code by the executing court to the High Court is a crucial step in the transmission of the decree for execution. Failure to retransmit the decree after such a certificate does not necessarily deprive the court of jurisdiction to proceed with execution, especially if the court retains seisin of the case (!) .

4. Jurisdiction to execute a decree is deemed to be retained if the court continues to act on the case, even if a formal certificate of non-satisfaction was not sent or was improperly handled, unless it is established that the court was without inherent jurisdiction from the outset (!) (!) .

5. Objections regarding jurisdiction, if not raised at the proper stage or if abandoned, cannot be revived later on the principle of res judicata, particularly when the party had the opportunity to raise such objections but chose not to (!) (!) .

6. Errors or irregularities in the execution process, even if erroneous, do not necessarily nullify the proceedings if the court had jurisdiction and the irregularity did not amount to a want of inherent jurisdiction (!) (!) .

7. The doctrine of res judicata extends to execution proceedings, and even decisions on questions of law or jurisdiction, if not challenged at the appropriate time, become binding and prevent the re-raising of the same objections in subsequent proceedings (!) (!) .

8. The principle that a court lacking inherent jurisdiction cannot validly decide a matter applies, and such decisions are null and cannot operate as res judicata (!) .

9. The overall legal principle emphasizes the importance of raising jurisdictional and other fundamental objections promptly during proceedings, as failure to do so results in those objections being barred from later consideration (!) (!) .

Please let me know if you need a more detailed analysis or specific guidance based on this case.