Agree the first two marks were used by Hans Jensen
Believe the firm did produce solid silver wares too.
However, since there are no standard or control marks, I think your candlesticks are silverplated.
The third mark is used by Hejl & Company of Denmark.
Early in their history they were manufacturers, but today I think they are mostly distributers/wholesalers.
They are still in business. You can find their site on the internet.