played some decisive roles \[22-25\]. In fact, we have obtained the proper dual SUSP unitary operator (and its Hermitian conjugate) from the [*universal*]{} unitary operators that have been derived in our earlier works \[26,27\] on [*interacting*]{} gauge theories. To be specific, we have already derived the explicit form of the SUSP unitary operator (and its Hermitian conjugate) in the 4$D$ interacting Abelian 1-form gauge theory with Dirac and complex scalar fields \[26\] as well as 4$D$ non-Abelian gauge theory with Dirac fields \[27\]. In our present investigation, we have obtained the [*dual*]{} SUSP unitary operator (and its Hermitian conjugate) from the [*duality*]{} operation on the [*universal*]{} SUSP unitary operators (that have already been derived in our earlier work \[26\] for the 4$D$ interacting Abelian theory). The form of the SUSP dual unitary operator (and its Hermitian conjugate) turns out to be [*universal*]{} for [*all*]{} the Abelian 1-form gauge models under consideration which are defined on the [*one*]{} and [*two*]{} dimensional Minkowskian flat spacetime manifold.

Our present investigation is essential on the following key considerations. First and foremost, as we have shown the [*universality*]{} of the SUSP [*unitary*]{} operator (and its Hermitian conjugate) in the context of the models under consideration 