29866 labor dispute/ contract of employment/ evidence Labor dispute Federal supreme court of Ethiopia cassation decisions volume 6 የውክልና ስልጣን ማስረጃ በወካይና በተወካይ መካከል የቅጥር ውል ስለመኖሩ የሚያስረዳ ስላለመሆኑ0Cassation Decision no. 29866