The expression "sale" as defined under section 2(g) of the Bihar Sales Tax Act, at the material time stood as follows : "Sale means, with all its grammatical variations and cognate expressions any transfer of property in goods for cash or deferred payment 465 or other valuable consideration, including a transfer of property in goods involved in the execution of contract but does not include a mortgage, hypothecation, charge or pledge : Provided that a transfer of goods on hire purchase or other instalment system of payment shall, notwithstanding the fact that the seller retains a title to any goods as security for payment of the price, be deemed to be a sale : Provided further that notwithstanding anything to the contrary in the Indian (111 of 1930), the sale of any goods which are actually in Bihar at the time when, in respect thereof, the contract of sale as defined in section 4 of that Act is made, shall, wherever the said contract of sale is made, lie deemed for the purpose of this Act to have been made in Bihar.