Declension table of ?yantrapattra

Neuter	Singular	Dual	Plural
Nominative	yantrapattram	yantrapattre	yantrapattrāṇi
Vocative	yantrapattra	yantrapattre	yantrapattrāṇi
Accusative	yantrapattram	yantrapattre	yantrapattrāṇi
Instrumental	yantrapattreṇa	yantrapattrābhyām	yantrapattraiḥ
Dative	yantrapattrāya	yantrapattrābhyām	yantrapattrebhyaḥ
Ablative	yantrapattrāt	yantrapattrābhyām	yantrapattrebhyaḥ
Genitive	yantrapattrasya	yantrapattrayoḥ	yantrapattrāṇām
Locative	yantrapattre	yantrapattrayoḥ	yantrapattreṣu

Compound yantrapattra -

Adverb -yantrapattram -yantrapattrāt