  Our goal is to generalize the Choe-Hoppe helicoid and Clifford cones in
Euclidean space. By sweeping out $L$ indpendent Clifford cones in
${\mathbb{R}}^{2N+2}$ via the multi-screw motion, we construct minimal
submanifolds in ${\mathbb{R}}^{L(2N+2)+1}$. Also, we sweep out the $L$-rays
Clifford cone (introduced in Section 2.3) in ${\mathbb{R}}^{L(2N+2)}$ to
construct minimal submanifolds in ${\mathbb{R}}^{L(2N+2)+1}$. Our minimal
submanifolds unify various interesting examples: Choe-Hoppe's helicoid of
codimension one, cone over Lawson's ruled minimal surfaces in
${\mathbb{S}}^{3}$, Barbosa-Dajczer-Jorge's ruled submanifolds, and
Harvey-Lawson's volume-minimizing twisted normal cone over the Clifford torus.
