У Блашка не было наследников и учен

У Блашка не было наследников и учеников, поэтому секрет и метод изготовления стеклянных произведений остался неизвестным.

Results (English) 1:

The Blaška had no heirs and disciples, so the secret of glass compositions and method of manufacture remains unknown.

Results (English) 2:

In Blaschke had no heirs and students, so the secret and method of manufacture of glass products is unknown.

Results (English) 3:

The Блашка was not heirs and pupils, therefore, it is no secret and method of manufacture glass works remains unknown.