Challenge Grille cipher / Flamm's Kryptograph

Flamm's Kryptograph, patented in USA, 1875.

A newspaper article published in the past covers an encrypted message written by the anonymous reader with pseudonym Tekew:

NVRDIEMHNEAT

IRVOAEINFYIU

BRNTTTEHSEUA

FHSEREPEFDRF

OORRMOSVTOHO

EIDFNOTSHTUH

RETRTEEEAMLE

EUGGSTSRIELA

TARIEGTEAMRY

OBSFOUCTTOHT

EMTRPHCOLIIE

XPSIHRTEIEYN

In Slovak:

Odkaz na šifrovanie pomocou Flammovho Kryptografu v slovenčine, Obzor, 1875, s.217-8:

 

Rozlúštenie tejto šifrovanej správy je nasledovné, vďaka čitateľovi s pseudonymom Narga na blogu Klausa Schmeha:

 I HAVE FURTHER PROVED THE UTILITY OF THIS INVENTION IN THE FORM OF THE TELEGRAM BUT TO RENDER IT SAFE FOR SHORT MESSAGES OTHER CIPHER MAY BE USED TO INSURE A GREATER COMPLEXITY

Later on, i found that  the Plaintext of the turning grille cipher challenge was presented in the next answer from reader with initials H. E. A. to Tekew's describing:

(To be continued)