Dispute settlement.
1st October Cardiff firm offered by letter to sell 1000 boxes of tinplates to NY firm
8th Oct Cardiff firm posted letter revoking their offer
10th Oct NY firm recieved the letter of offer
11th Oct NY firm telegraphed acceptance of the offer
15th Oct NY firm posted a letter confirming its telegraphed acceptance
20th Oct NY firm received letter of revocation from Cardiff firm
Did the acceptance occur ?