Hulu Perak district delivery ceremony was held at Kroh on July 16 , 1909 .
After the Anglo - Siamese Treaty of 1909 , the Siamese transferred the northern part of Hulu Perak district to the Federated Malay States , of which Perak is part of .
Perak   district delivery ceremony was held at Kroh on July 16 , 1909 .
After the Anglo - Siamese Treaty of 1909 , the Siamese transferred the northern part of Hulu Perak district to the Federated Malay States , of which Perak is part of .