Мы получили ваше письмо от 17 мая с

Мы получили ваше письмо от 17 мая с предложением о внесении изменений в конструкции станка, который вы должны поставить по Контракту 21/8.

Результаты (английский) 1:

We received your letter dated 17 May with the proposal to amend the design of the machine, which you have to put on the contract/21 8.

Результаты (английский) 2:

We have received your letter of May 17, a proposal to amend the design of the machine, you need to put under the Contract 21/8.

Результаты (английский) 3:

we have received your letter dated may 17, proposed changes in the design of the machine, you should put a contract on 21 / 8.