335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, 291 for magnets and electromagnets structure of the lifting, holding or tractive type which may include coils of the bank-wound or other cross-wound types.
(tractive type; may include; coils of the bank-wound or other cross-wound types)
tractive type
may include
coils of the bank-wound or other cross-wound types